{"id":107,"date":"2021-01-21T19:23:40","date_gmt":"2021-01-22T00:23:40","guid":{"rendered":"https:\/\/pressbooks.bccampus.ca\/math021\/chapter\/subtraction\/"},"modified":"2025-07-09T18:17:16","modified_gmt":"2025-07-09T22:17:16","slug":"subtraction","status":"publish","type":"chapter","link":"https:\/\/pressbooks.bccampus.ca\/math021\/chapter\/subtraction\/","title":{"raw":"Topic A: Subtraction","rendered":"Topic A: Subtraction"},"content":{"raw":"<strong>Subtraction <\/strong>takes an amount <strong>away <\/strong>from another amount. The result of subtraction is called the <strong>difference.<\/strong>\r\n\r\nThe <strong>minus sign<\/strong> \u2212 means to subtract.\r\n\r\n<img class=\"aligncenter size-full wp-image-106\" src=\"https:\/\/pressbooks.bccampus.ca\/wp-content\/uploads\/sites\/2379\/2021\/01\/9-3.jpg\" alt=\"nine minus three is six\" width=\"262\" height=\"40\" \/>\r\n\r\nsays nine minus three equals six <strong>or <\/strong>nine take away three is six.\r\n\r\nThe <strong>difference <\/strong>between 9 and 3 is 6.\r\n\r\nSubtraction is the opposite of addition.\r\n\r\n<strong>Look at the examples:<\/strong>\r\n<p style=\"text-align: center\">[latex]\\large \\begin{array}{cc}5+4=9 &amp; 9-4=5 \\\\ 4+5=9 &amp; 9-5=4\\end{array}[\/latex]<\/p>\r\n<p style=\"text-align: center\">[latex]\\large \\begin{array}{cc}\\begin{array}{r}8\\\\+3\\\\ \\hline 11\\end{array} &amp; \\begin{array}{r}11\\\\-3\\\\ \\hline 8 \\end{array} \\\\ \\begin{array}{r}3\\\\+8\\\\ \\hline 11 \\end{array} &amp; \\begin{array}{r}11\\\\-8\\\\ \\hline 3\\end{array}\\end{array}[\/latex]<\/p>\r\n<strong>Subtraction facts<\/strong> are a tool that you will use to do subtraction questions.\r\n<div class=\"textbox textbox--exercises\"><header class=\"textbox__header\">\r\n<p class=\"textbox__title\">Exercise 1<\/p>\r\n\r\n<\/header>\r\n<div class=\"textbox__content\">\r\n\r\nCheck out your <strong>subtraction facts <\/strong>by doing the following exercises as quickly as you can. Use your addition facts to help find the subtraction facts. Check your work using the answer key at the end of the exercises. Then, make a list of any subtraction facts you do not know or which are slow for you and practice them.\r\n<ol class=\"threecolumn\" type=\"a\">\r\n \t<li>[latex]\\begin{align*}5\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}3\\\\-2\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}7\\\\-7\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}1\\\\-0\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}8\\\\-2\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}9\\\\-7\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}4\\\\-3\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}6\\\\-1\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}7\\\\-2\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}2\\\\-2\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}7\\\\-6\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}8\\\\-7\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n<\/ol>\r\n<strong>Answers to Exercise 1<\/strong>\r\n<ol class=\"threecolumn\" type=\"a\">\r\n \t<li>1<\/li>\r\n \t<li>1<\/li>\r\n \t<li>0<\/li>\r\n \t<li>1<\/li>\r\n \t<li>6<\/li>\r\n \t<li>2<\/li>\r\n \t<li>1<\/li>\r\n \t<li>5<\/li>\r\n \t<li>5<\/li>\r\n \t<li>0<\/li>\r\n \t<li>1<\/li>\r\n \t<li>1<\/li>\r\n<\/ol>\r\n<\/div>\r\n<\/div>\r\n<div class=\"textbox textbox--exercises\"><header class=\"textbox__header\">\r\n<p class=\"textbox__title\">Exercise 2<\/p>\r\n\r\n<\/header>\r\n<div class=\"textbox__content\">\r\n<ol class=\"threecolumn\" type=\"a\">\r\n \t<li>[latex]\\begin{align*}8\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}9\\\\-1\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}7\\\\-5\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}6\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}9\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}5\\\\-2\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}2\\\\-0\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}6\\\\-3\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}8\\\\-3\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}6\\\\-5\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}4\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}9\\\\-0\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n<\/ol>\r\n<strong>Answers to Exercise 2<\/strong>\r\n<ol class=\"threecolumn\" type=\"a\">\r\n \t<li>4<\/li>\r\n \t<li>8<\/li>\r\n \t<li>2<\/li>\r\n \t<li>2<\/li>\r\n \t<li>5<\/li>\r\n \t<li>3<\/li>\r\n \t<li>2<\/li>\r\n \t<li>3<\/li>\r\n \t<li>5<\/li>\r\n \t<li>1<\/li>\r\n \t<li>0<\/li>\r\n \t<li>9<\/li>\r\n<\/ol>\r\n<\/div>\r\n<\/div>\r\n<div class=\"textbox textbox--exercises\"><header class=\"textbox__header\">\r\n<p class=\"textbox__title\">Exercise 3<\/p>\r\n\r\n<\/header>\r\n<div class=\"textbox__content\">\r\n<ol class=\"threecolumn\" type=\"a\">\r\n \t<li>[latex]\\begin{align*}8\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}5\\\\-5\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}2\\\\-1\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}4\\\\-3\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}3\\\\-3\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}6\\\\-3\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}7\\\\-6\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}9\\\\-2\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}9\\\\-0\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}5\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}8\\\\-8\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}4\\\\-2\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}7\\\\-7\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}2\\\\-0\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}6\\\\-1\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}9\\\\-8\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n<\/ol>\r\n<strong>Answers to Exercise 3<\/strong>\r\n<ol class=\"threecolumn\" type=\"a\">\r\n \t<li>4<\/li>\r\n \t<li>0<\/li>\r\n \t<li>1<\/li>\r\n \t<li>1<\/li>\r\n \t<li>0<\/li>\r\n \t<li>3<\/li>\r\n \t<li>1<\/li>\r\n \t<li>7<\/li>\r\n \t<li>9<\/li>\r\n \t<li>1<\/li>\r\n \t<li>0<\/li>\r\n \t<li>2<\/li>\r\n \t<li>0<\/li>\r\n \t<li>2<\/li>\r\n \t<li>5<\/li>\r\n \t<li>1<\/li>\r\n<\/ol>\r\n<\/div>\r\n<\/div>\r\n<div class=\"textbox textbox--exercises\"><header class=\"textbox__header\">\r\n<p class=\"textbox__title\">Exercise 4<\/p>\r\n\r\n<\/header>\r\n<div class=\"textbox__content\">\r\n<ol class=\"threecolumn\" type=\"a\">\r\n \t<li>[latex]\\begin{align*}11\\\\-7\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}10\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}12\\\\-7\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}8\\\\-6\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}10\\\\-8\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}7\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}9\\\\-3\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}9\\\\-5\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n<\/ol>\r\n<strong>Answers to Exercise 4<\/strong>\r\n<ol class=\"threecolumn\" type=\"a\">\r\n \t<li>4<\/li>\r\n \t<li>6<\/li>\r\n \t<li>5<\/li>\r\n \t<li>2<\/li>\r\n \t<li>2<\/li>\r\n \t<li>3<\/li>\r\n \t<li>6<\/li>\r\n \t<li>4<\/li>\r\n<\/ol>\r\n<\/div>\r\n<\/div>\r\n<div class=\"textbox textbox--exercises\"><header class=\"textbox__header\">\r\n<p class=\"textbox__title\">Exercise 5<\/p>\r\n\r\n<\/header>\r\n<div class=\"textbox__content\">\r\n<ol class=\"threecolumn\" type=\"a\">\r\n \t<li>[latex]\\begin{align*}12\\\\-3\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}9\\\\-6\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}11\\\\-9\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}10\\\\-5\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}8\\\\-8\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}10\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}12\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}7\\\\-6\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n<\/ol>\r\n<strong>Answers to Exercise 5<\/strong>\r\n<ol class=\"threecolumn\" type=\"a\">\r\n \t<li>9<\/li>\r\n \t<li>3<\/li>\r\n \t<li>2<\/li>\r\n \t<li>5<\/li>\r\n \t<li>0<\/li>\r\n \t<li>6<\/li>\r\n \t<li>8<\/li>\r\n \t<li>1<\/li>\r\n<\/ol>\r\n<\/div>\r\n<\/div>\r\n<div class=\"textbox textbox--exercises\"><header class=\"textbox__header\">\r\n<p class=\"textbox__title\">Exercise 6<\/p>\r\n\r\n<\/header>\r\n<div class=\"textbox__content\">\r\n<ol class=\"threecolumn\" type=\"a\">\r\n \t<li>[latex]\\begin{align*}11\\\\-7\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}12\\\\-6\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}10\\\\-9\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}8\\\\-3\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}12\\\\-5\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}10\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}9\\\\-7\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}7\\\\-3\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}8\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}11\\\\-9\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}9\\\\-5\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}7\\\\-2\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n<\/ol>\r\n<strong>Answers to Exercise 6<\/strong>\r\n<ol class=\"threecolumn\" type=\"a\">\r\n \t<li>4<\/li>\r\n \t<li>6<\/li>\r\n \t<li>1<\/li>\r\n \t<li>5<\/li>\r\n \t<li>7<\/li>\r\n \t<li>6<\/li>\r\n \t<li>2<\/li>\r\n \t<li>4<\/li>\r\n \t<li>4<\/li>\r\n \t<li>2<\/li>\r\n \t<li>1<\/li>\r\n \t<li>5<\/li>\r\n<\/ol>\r\n<\/div>\r\n<\/div>\r\n<div class=\"textbox textbox--exercises\"><header class=\"textbox__header\">\r\n<p class=\"textbox__title\">Exercise 6<\/p>\r\n\r\n<\/header>\r\n<div class=\"textbox__content\">\r\n<ol class=\"threecolumn\" type=\"a\">\r\n \t<li>[latex]\\begin{align*}11\\\\-7\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}12\\\\-6\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}10\\\\-9\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}8\\\\-3\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}12\\\\-5\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}10\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}9\\\\-7\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}7\\\\-3\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}8\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}11\\\\-9\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}6\\\\-5\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}7\\\\-2\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n<\/ol>\r\n<strong>Answers to Exercise 6<\/strong>\r\n<ol class=\"threecolumn\" type=\"a\">\r\n \t<li>4<\/li>\r\n \t<li>6<\/li>\r\n \t<li>1<\/li>\r\n \t<li>5<\/li>\r\n \t<li>7<\/li>\r\n \t<li>6<\/li>\r\n \t<li>2<\/li>\r\n \t<li>4<\/li>\r\n \t<li>4<\/li>\r\n \t<li>2<\/li>\r\n \t<li>4<\/li>\r\n \t<li>5<\/li>\r\n<\/ol>\r\n<\/div>\r\n<\/div>\r\n<div class=\"textbox textbox--exercises\"><header class=\"textbox__header\">\r\n<p class=\"textbox__title\">Exercise 7<\/p>\r\n\r\n<\/header>\r\n<div class=\"textbox__content\">\r\n<ol class=\"threecolumn\" type=\"a\">\r\n \t<li>[latex]\\begin{align*}13\\\\-5\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}10\\\\-1\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}9\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}5\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}9\\\\-9\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}16\\\\-8\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}11\\\\-7\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}6\\\\-3\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}18\\\\-9\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}7\\\\-2\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}13\\\\-7\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}8\\\\-6\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n<\/ol>\r\n<strong>Answers to Exercise 7<\/strong>\r\n<ol class=\"threecolumn\" type=\"a\">\r\n \t<li>8<\/li>\r\n \t<li>9<\/li>\r\n \t<li>5<\/li>\r\n \t<li>1<\/li>\r\n \t<li>0<\/li>\r\n \t<li>8<\/li>\r\n \t<li>4<\/li>\r\n \t<li>3<\/li>\r\n \t<li>9<\/li>\r\n \t<li>5<\/li>\r\n \t<li>6<\/li>\r\n \t<li>2<\/li>\r\n<\/ol>\r\n<\/div>\r\n<\/div>\r\nPractice your subtraction facts using dominoes. Place all the dominoes face down.\r\n<div class=\"textbox textbox--exercises\"><header class=\"textbox__header\">\r\n<p class=\"textbox__title\">Exercise 8<\/p>\r\n\r\n<\/header>\r\n<div class=\"textbox__content\">\r\n<ol class=\"threecolumn\" type=\"a\">\r\n \t<li>[latex]\\begin{align*}12\\\\-3\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}6\\\\-2\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}10\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}11\\\\-9\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}1\\\\-0\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}8\\\\-1\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}12\\\\-5\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}11\\\\-2\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}3\\\\-2\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}11\\\\-8\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}14\\\\-7\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}8\\\\-3\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}15\\\\-9\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}9\\\\-7\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}7\\\\-1\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}11\\\\-5\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n<\/ol>\r\n<strong>Answers to Exercise 8<\/strong>\r\n<ol class=\"threecolumn\" type=\"a\">\r\n \t<li>9<\/li>\r\n \t<li>4<\/li>\r\n \t<li>6<\/li>\r\n \t<li>2<\/li>\r\n \t<li>1<\/li>\r\n \t<li>7<\/li>\r\n \t<li>7<\/li>\r\n \t<li>9<\/li>\r\n \t<li>1<\/li>\r\n \t<li>3<\/li>\r\n \t<li>7<\/li>\r\n \t<li>5<\/li>\r\n \t<li>6<\/li>\r\n \t<li>2<\/li>\r\n \t<li>6<\/li>\r\n \t<li>6<\/li>\r\n<\/ol>\r\n<\/div>\r\n<\/div>\r\n<div class=\"textbox textbox--examples\"><header class=\"textbox__header\">\r\n<p class=\"textbox__title\">Need some extra practice?<\/p>\r\n\r\n<\/header>\r\n<div class=\"textbox__content\">\r\n<ul>\r\n \t<li>Find a partner and play this card game.<\/li>\r\n \t<li>Using a regular deck of cards, a jack will be eleven, a queen will be twelve and a king will be thirteen.<\/li>\r\n \t<li>Shuffle the cards and deal them out. Keep your cards in a pile in front of you.<\/li>\r\n \t<li>Each player flips over a card.<\/li>\r\n \t<li>Take turns subtracting the numbers on the cards. If the person gets the right answer that person gets to keep the cards. If the person get the wrong answer the other player gets the cards.<\/li>\r\n \t<li>The person who collects all the cards is the winner.<\/li>\r\n \t<li>You could also set a time limit and the person with the most cards when time is up is the winner.<\/li>\r\n<\/ul>\r\n<\/div>\r\n<\/div>\r\n<h1>Subtracting Across<\/h1>\r\nSo far you have only been subtracting numbers when they are <strong>up and down <\/strong>or <strong>vertical.<\/strong>\r\n\r\n<strong>Example:<\/strong>\r\n<p style=\"text-align: center\">[latex]\\begin{align*}9\\\\-5\\\\ \\hline 4 \\end{align*}[\/latex]<\/p>\r\nAnother way to subtract numbers is <strong>across <\/strong>or <strong>horizontally.<\/strong>\r\n<p style=\"text-align: center\">9 \u2212 5 = 4<\/p>\r\nWhen you subtract numbers across, you work from left to right.\r\n<div class=\"textbox textbox--exercises\"><header class=\"textbox__header\">\r\n<p class=\"textbox__title\">Exercise 9<\/p>\r\n\r\n<\/header>\r\n<div class=\"textbox__content\">\r\n\r\nPractice subtracting across or horizontally. Check your work using the answer key at the end of the exercise.\r\n<ol class=\"twocolumn\" type=\"a\">\r\n \t<li>6 \u2212 3 =<\/li>\r\n \t<li>12 \u2212 8 =<\/li>\r\n \t<li>4 \u2212 1 =<\/li>\r\n \t<li>8 \u2212 6 =<\/li>\r\n \t<li>18 \u2212 9 =<\/li>\r\n \t<li>11 \u2212 4 =<\/li>\r\n \t<li>7 \u2212 2 =<\/li>\r\n \t<li>16 \u2212 7 =<\/li>\r\n \t<li>10 \u2212 5 =<\/li>\r\n \t<li>2 \u2212 0 =<\/li>\r\n \t<li>9 \u2212 5 =<\/li>\r\n \t<li>17 \u2212 8 =<\/li>\r\n<\/ol>\r\n<strong>Answers to Exercise 9<\/strong>\r\n<ol class=\"twocolumn\" type=\"a\">\r\n \t<li>3<\/li>\r\n \t<li>4<\/li>\r\n \t<li>3<\/li>\r\n \t<li>2<\/li>\r\n \t<li>9<\/li>\r\n \t<li>7<\/li>\r\n \t<li>5<\/li>\r\n \t<li>9<\/li>\r\n \t<li>5<\/li>\r\n \t<li>2<\/li>\r\n \t<li>4<\/li>\r\n \t<li>9<\/li>\r\n<\/ol>\r\n<\/div>\r\n<\/div>\r\n<div class=\"textbox textbox--exercises\"><header class=\"textbox__header\">\r\n<p class=\"textbox__title\">Exercise 10<\/p>\r\n\r\n<\/header>\r\n<div class=\"textbox__content\">\r\n\r\nPractice subtracting across or horizontally. Check your work using the answer key at the end of the exercise.\r\n<ol class=\"twocolumn\" type=\"a\">\r\n \t<li>9 \u2212 6 =<\/li>\r\n \t<li>14 \u2212 5 =<\/li>\r\n \t<li>8 \u2212 4 =<\/li>\r\n \t<li>7 \u2212 1 =<\/li>\r\n \t<li>11 \u2212 7 =<\/li>\r\n \t<li>5 \u2212 0 =<\/li>\r\n \t<li>4 \u2212 3 =<\/li>\r\n \t<li>15 \u2212 8 =<\/li>\r\n \t<li>11 \u2212 9 =<\/li>\r\n \t<li>10 \u2212 2 =<\/li>\r\n \t<li>9 \u2212 2 =<\/li>\r\n \t<li>8 \u2212 3 =<\/li>\r\n<\/ol>\r\n<strong>Answers to Exercise 10<\/strong>\r\n<ol class=\"twocolumn\" type=\"a\">\r\n \t<li>3<\/li>\r\n \t<li>9<\/li>\r\n \t<li>4<\/li>\r\n \t<li>6<\/li>\r\n \t<li>4<\/li>\r\n \t<li>5<\/li>\r\n \t<li>1<\/li>\r\n \t<li>7<\/li>\r\n \t<li>2<\/li>\r\n \t<li>8<\/li>\r\n \t<li>7<\/li>\r\n \t<li>5<\/li>\r\n<\/ol>\r\n<\/div>\r\n<\/div>\r\n<div class=\"textbox textbox--exercises\"><header class=\"textbox__header\">\r\n<p class=\"textbox__title\">Exercise 11<\/p>\r\n\r\n<\/header>\r\n<div class=\"textbox__content\">\r\n\r\nPractice subtracting across or horizontally. Check your work using the answer key at the end of the exercise.\r\n<ol class=\"twocolumn\" type=\"a\">\r\n \t<li>3 \u2212 2 =<\/li>\r\n \t<li>17 \u2212 9 =<\/li>\r\n \t<li>14 \u2212 7 =<\/li>\r\n \t<li>9 \u2212 3 =<\/li>\r\n \t<li>12 \u2212 5 =<\/li>\r\n \t<li>8 \u2212 8 =<\/li>\r\n \t<li>6 \u2212 1 =<\/li>\r\n \t<li>13 \u2212 4 =<\/li>\r\n \t<li>11 \u2212 6 =<\/li>\r\n \t<li>4 \u2212 0 =<\/li>\r\n \t<li>8 \u2212 1 =<\/li>\r\n \t<li>16 \u2212 9 =<\/li>\r\n \t<li>7 \u2212 0 =<\/li>\r\n \t<li>13 \u2212 8 =<\/li>\r\n \t<li>12 \u2212 3 =<\/li>\r\n \t<li>9 \u2212 4 =<\/li>\r\n \t<li>15 \u2212 7 =<\/li>\r\n \t<li>10 \u2212 6 =<\/li>\r\n \t<li>11 \u2212 5 =<\/li>\r\n \t<li>5 \u2212 2 =<\/li>\r\n<\/ol>\r\n<strong>Answers to Exercise 11<\/strong>\r\n<ol class=\"twocolumn\" type=\"a\">\r\n \t<li>1<\/li>\r\n \t<li>8<\/li>\r\n \t<li>7<\/li>\r\n \t<li>6<\/li>\r\n \t<li>7<\/li>\r\n \t<li>0<\/li>\r\n \t<li>5<\/li>\r\n \t<li>9<\/li>\r\n \t<li>5<\/li>\r\n \t<li>4<\/li>\r\n \t<li>7<\/li>\r\n \t<li>7<\/li>\r\n \t<li>7<\/li>\r\n \t<li>5<\/li>\r\n \t<li>9<\/li>\r\n \t<li>5<\/li>\r\n \t<li>8<\/li>\r\n \t<li>4<\/li>\r\n \t<li>6<\/li>\r\n \t<li>3<\/li>\r\n<\/ol>\r\n<\/div>\r\n<\/div>\r\n<h1>Word Problems<\/h1>\r\nLearning subtraction facts is very important because once you know them all they become a tool to use when solving problems.\r\n\r\nWords such as:\r\n<ul>\r\n \t<li>less than<\/li>\r\n \t<li>minus<\/li>\r\n \t<li>subtracted from<\/li>\r\n \t<li>how many more<\/li>\r\n \t<li>how much more, and<\/li>\r\n \t<li>difference<\/li>\r\n<\/ul>\r\ntell you to subtract the numbers.\r\n\r\nLook for these words when reading word problems and <span style=\"text-decoration: underline\">underline them<\/span> before trying to solve a problem. <span style=\"border: 1px solid;border-radius: 25px;padding: 2px 2px 2px 2px\">Circle<\/span> the information that is given.\r\n\r\n<strong>Example: <\/strong>\r\n\r\nThere were 14 nails in a box. Lu used 7 of them. How many nails were still in the box?\r\n\r\nThere were <span style=\"border: 1px solid;border-radius: 25px;padding: 2px 2px 2px 2px\">14 nails<\/span> in a box. Lu <span style=\"border: 1px solid;border-radius: 25px;padding: 2px 2px 2px 2px\">used 7<\/span> of them. <span style=\"text-decoration: underline\">How many<\/span> nails were still in the box?\r\n\r\nYou have circled 14 nails and 7. This is the information you will use to find the answer.\r\n\r\nYou have underlined \u201chow many\u201d. These words tell you to subtract.\r\n<p style=\"text-align: center\">[latex]\\begin{align*} 14 \\text{ nails} \\\\ -7 \\text{ nails} \\\\ \\hline 7 \\text{ nails} \\end{align*}[\/latex]<\/p>\r\n\r\n<div class=\"textbox textbox--exercises\"><header class=\"textbox__header\">\r\n<p class=\"textbox__title\">Exercise 12<\/p>\r\n\r\n<\/header>\r\n<div class=\"textbox__content\">\r\n<ol type=\"a\">\r\n \t<li>Wolfgang walked 11 blocks. Ingrid walked 6 blocks. Wolfgang walked how much farther than Ingrid?<\/li>\r\n \t<li>Mika and her father went fishing. Mika caught 18 fish and her father caught 9 fish. How many more fish did Mika catch?<\/li>\r\n \t<li>Kuan-Lin was making moon cakes for the class party. She needed 15 cakes for the party. On Monday she had made 7 moon cakes. How many moon cakes did she still need to make?<\/li>\r\n \t<li>Malik counted 12 cars in the parking lot where he worked. One hour later, he counted only 4 cars. How many cars left?<\/li>\r\n<\/ol>\r\n<strong>Answers to Exercise 12<\/strong>\r\n<ol class=\"twocolumn\" type=\"a\">\r\n \t<li>5 blocks<\/li>\r\n \t<li>9 fish<\/li>\r\n \t<li>8 moon cakes<\/li>\r\n \t<li>8 cars<\/li>\r\n<\/ol>\r\n<\/div>\r\n<\/div>\r\n<h1>Topic A Self-Test<\/h1>\r\n<strong>Mark \/21 Aim 18\/27<\/strong>\r\n<ol type=\"A\">\r\n \t<li>Find the difference. Be sure to check your answers. (9 marks)\r\n<ol class=\"threecolumn\" type=\"a\">\r\n \t<li>[latex]\\begin{align*}16\\\\-8\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}18\\\\-9\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}14\\\\-8\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}11\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}9\\\\-3\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}17\\\\-9\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}10\\\\-6\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}7\\\\-5\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}15\\\\-6\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n<\/ol>\r\n<\/li>\r\n \t<li>Find the difference. Be sure to check your answers. (6 marks)\r\n<ol class=\"threecolumn\" type=\"a\">\r\n \t<li>3 \u2212 2 =<\/li>\r\n \t<li>17 \u2212 9 =<\/li>\r\n \t<li>14 \u2212 7 =<\/li>\r\n \t<li>9 \u2212 3 =<\/li>\r\n \t<li>12 \u2212 5 =<\/li>\r\n \t<li>8 \u2212 8 =<\/li>\r\n<\/ol>\r\n<\/li>\r\n \t<li>Solve each of the following word problems. Be sure to include the unit of measure in your answer. Be sure to <span style=\"border: 1px solid;border-radius: 25px;padding: 2px 2px 2px 2px\">circle<\/span> the information and <span style=\"text-decoration: underline\">underline<\/span> what's being asked.(6 marks, 2 marks each)\r\n<ol type=\"a\">\r\n \t<li>Shada caught 17 fish. She gave 8 fish to her grandmother. How many fish did she have left?<\/li>\r\n \t<li>Yuan went to the store with $15 to buy some rice. The rice cost $6. How much did he have left?<\/li>\r\n \t<li>Carlo had 13 metres of fencing. He used 8 metres around his flower garden. How many metres did he have left?<\/li>\r\n<\/ol>\r\n<\/li>\r\n<\/ol>\r\n<strong>Answers to Topic A Self-Test<\/strong>\r\n<ol type=\"A\">\r\n \t<li>\r\n<ol class=\"threecolumn\" type=\"a\">\r\n \t<li>8<\/li>\r\n \t<li>9<\/li>\r\n \t<li>6<\/li>\r\n \t<li>7<\/li>\r\n \t<li>6<\/li>\r\n \t<li>8<\/li>\r\n \t<li>4<\/li>\r\n \t<li>2<\/li>\r\n \t<li>9<\/li>\r\n<\/ol>\r\n<\/li>\r\n \t<li>\r\n<ol class=\"threecolumn\" type=\"a\">\r\n \t<li>1<\/li>\r\n \t<li>8<\/li>\r\n \t<li>7<\/li>\r\n \t<li>6<\/li>\r\n \t<li>7<\/li>\r\n \t<li>0<\/li>\r\n<\/ol>\r\n<\/li>\r\n \t<li>\r\n<ol class=\"threecolumn\" type=\"a\">\r\n \t<li>9 fish<\/li>\r\n \t<li>$9<\/li>\r\n \t<li>5 metres<\/li>\r\n<\/ol>\r\n<\/li>\r\n<\/ol>","rendered":"<p><strong>Subtraction <\/strong>takes an amount <strong>away <\/strong>from another amount. The result of subtraction is called the <strong>difference.<\/strong><\/p>\n<p>The <strong>minus sign<\/strong> \u2212 means to subtract.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-106\" src=\"https:\/\/pressbooks.bccampus.ca\/wp-content\/uploads\/sites\/2379\/2021\/01\/9-3.jpg\" alt=\"nine minus three is six\" width=\"262\" height=\"40\" srcset=\"https:\/\/pressbooks.bccampus.ca\/math021\/wp-content\/uploads\/sites\/2379\/2021\/01\/9-3.jpg 262w, https:\/\/pressbooks.bccampus.ca\/math021\/wp-content\/uploads\/sites\/2379\/2021\/01\/9-3-65x10.jpg 65w, https:\/\/pressbooks.bccampus.ca\/math021\/wp-content\/uploads\/sites\/2379\/2021\/01\/9-3-225x34.jpg 225w\" sizes=\"auto, (max-width: 262px) 100vw, 262px\" \/><\/p>\n<p>says nine minus three equals six <strong>or <\/strong>nine take away three is six.<\/p>\n<p>The <strong>difference <\/strong>between 9 and 3 is 6.<\/p>\n<p>Subtraction is the opposite of addition.<\/p>\n<p><strong>Look at the examples:<\/strong><\/p>\n<p style=\"text-align: center\">[latex]\\large \\begin{array}{cc}5+4=9 & 9-4=5 \\\\ 4+5=9 & 9-5=4\\end{array}[\/latex]<\/p>\n<p style=\"text-align: center\">[latex]\\large \\begin{array}{cc}\\begin{array}{r}8\\\\+3\\\\ \\hline 11\\end{array} & \\begin{array}{r}11\\\\-3\\\\ \\hline 8 \\end{array} \\\\ \\begin{array}{r}3\\\\+8\\\\ \\hline 11 \\end{array} & \\begin{array}{r}11\\\\-8\\\\ \\hline 3\\end{array}\\end{array}[\/latex]<\/p>\n<p><strong>Subtraction facts<\/strong> are a tool that you will use to do subtraction questions.<\/p>\n<div class=\"textbox textbox--exercises\">\n<header class=\"textbox__header\">\n<p class=\"textbox__title\">Exercise 1<\/p>\n<\/header>\n<div class=\"textbox__content\">\n<p>Check out your <strong>subtraction facts <\/strong>by doing the following exercises as quickly as you can. Use your addition facts to help find the subtraction facts. Check your work using the answer key at the end of the exercises. Then, make a list of any subtraction facts you do not know or which are slow for you and practice them.<\/p>\n<ol class=\"threecolumn\" type=\"a\">\n<li>[latex]\\begin{align*}5\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}3\\\\-2\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}7\\\\-7\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}1\\\\-0\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}8\\\\-2\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}9\\\\-7\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}4\\\\-3\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}6\\\\-1\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}7\\\\-2\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}2\\\\-2\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}7\\\\-6\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}8\\\\-7\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<\/ol>\n<p><strong>Answers to Exercise 1<\/strong><\/p>\n<ol class=\"threecolumn\" type=\"a\">\n<li>1<\/li>\n<li>1<\/li>\n<li>0<\/li>\n<li>1<\/li>\n<li>6<\/li>\n<li>2<\/li>\n<li>1<\/li>\n<li>5<\/li>\n<li>5<\/li>\n<li>0<\/li>\n<li>1<\/li>\n<li>1<\/li>\n<\/ol>\n<\/div>\n<\/div>\n<div class=\"textbox textbox--exercises\">\n<header class=\"textbox__header\">\n<p class=\"textbox__title\">Exercise 2<\/p>\n<\/header>\n<div class=\"textbox__content\">\n<ol class=\"threecolumn\" type=\"a\">\n<li>[latex]\\begin{align*}8\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}9\\\\-1\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}7\\\\-5\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}6\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}9\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}5\\\\-2\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}2\\\\-0\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}6\\\\-3\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}8\\\\-3\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}6\\\\-5\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}4\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}9\\\\-0\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<\/ol>\n<p><strong>Answers to Exercise 2<\/strong><\/p>\n<ol class=\"threecolumn\" type=\"a\">\n<li>4<\/li>\n<li>8<\/li>\n<li>2<\/li>\n<li>2<\/li>\n<li>5<\/li>\n<li>3<\/li>\n<li>2<\/li>\n<li>3<\/li>\n<li>5<\/li>\n<li>1<\/li>\n<li>0<\/li>\n<li>9<\/li>\n<\/ol>\n<\/div>\n<\/div>\n<div class=\"textbox textbox--exercises\">\n<header class=\"textbox__header\">\n<p class=\"textbox__title\">Exercise 3<\/p>\n<\/header>\n<div class=\"textbox__content\">\n<ol class=\"threecolumn\" type=\"a\">\n<li>[latex]\\begin{align*}8\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}5\\\\-5\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}2\\\\-1\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}4\\\\-3\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}3\\\\-3\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}6\\\\-3\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}7\\\\-6\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}9\\\\-2\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}9\\\\-0\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}5\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}8\\\\-8\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}4\\\\-2\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}7\\\\-7\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}2\\\\-0\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}6\\\\-1\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}9\\\\-8\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<\/ol>\n<p><strong>Answers to Exercise 3<\/strong><\/p>\n<ol class=\"threecolumn\" type=\"a\">\n<li>4<\/li>\n<li>0<\/li>\n<li>1<\/li>\n<li>1<\/li>\n<li>0<\/li>\n<li>3<\/li>\n<li>1<\/li>\n<li>7<\/li>\n<li>9<\/li>\n<li>1<\/li>\n<li>0<\/li>\n<li>2<\/li>\n<li>0<\/li>\n<li>2<\/li>\n<li>5<\/li>\n<li>1<\/li>\n<\/ol>\n<\/div>\n<\/div>\n<div class=\"textbox textbox--exercises\">\n<header class=\"textbox__header\">\n<p class=\"textbox__title\">Exercise 4<\/p>\n<\/header>\n<div class=\"textbox__content\">\n<ol class=\"threecolumn\" type=\"a\">\n<li>[latex]\\begin{align*}11\\\\-7\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}10\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}12\\\\-7\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}8\\\\-6\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}10\\\\-8\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}7\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}9\\\\-3\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}9\\\\-5\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<\/ol>\n<p><strong>Answers to Exercise 4<\/strong><\/p>\n<ol class=\"threecolumn\" type=\"a\">\n<li>4<\/li>\n<li>6<\/li>\n<li>5<\/li>\n<li>2<\/li>\n<li>2<\/li>\n<li>3<\/li>\n<li>6<\/li>\n<li>4<\/li>\n<\/ol>\n<\/div>\n<\/div>\n<div class=\"textbox textbox--exercises\">\n<header class=\"textbox__header\">\n<p class=\"textbox__title\">Exercise 5<\/p>\n<\/header>\n<div class=\"textbox__content\">\n<ol class=\"threecolumn\" type=\"a\">\n<li>[latex]\\begin{align*}12\\\\-3\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}9\\\\-6\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}11\\\\-9\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}10\\\\-5\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}8\\\\-8\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}10\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}12\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}7\\\\-6\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<\/ol>\n<p><strong>Answers to Exercise 5<\/strong><\/p>\n<ol class=\"threecolumn\" type=\"a\">\n<li>9<\/li>\n<li>3<\/li>\n<li>2<\/li>\n<li>5<\/li>\n<li>0<\/li>\n<li>6<\/li>\n<li>8<\/li>\n<li>1<\/li>\n<\/ol>\n<\/div>\n<\/div>\n<div class=\"textbox textbox--exercises\">\n<header class=\"textbox__header\">\n<p class=\"textbox__title\">Exercise 6<\/p>\n<\/header>\n<div class=\"textbox__content\">\n<ol class=\"threecolumn\" type=\"a\">\n<li>[latex]\\begin{align*}11\\\\-7\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}12\\\\-6\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}10\\\\-9\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}8\\\\-3\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}12\\\\-5\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}10\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}9\\\\-7\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}7\\\\-3\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}8\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}11\\\\-9\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}9\\\\-5\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}7\\\\-2\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<\/ol>\n<p><strong>Answers to Exercise 6<\/strong><\/p>\n<ol class=\"threecolumn\" type=\"a\">\n<li>4<\/li>\n<li>6<\/li>\n<li>1<\/li>\n<li>5<\/li>\n<li>7<\/li>\n<li>6<\/li>\n<li>2<\/li>\n<li>4<\/li>\n<li>4<\/li>\n<li>2<\/li>\n<li>1<\/li>\n<li>5<\/li>\n<\/ol>\n<\/div>\n<\/div>\n<div class=\"textbox textbox--exercises\">\n<header class=\"textbox__header\">\n<p class=\"textbox__title\">Exercise 6<\/p>\n<\/header>\n<div class=\"textbox__content\">\n<ol class=\"threecolumn\" type=\"a\">\n<li>[latex]\\begin{align*}11\\\\-7\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}12\\\\-6\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}10\\\\-9\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}8\\\\-3\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}12\\\\-5\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}10\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}9\\\\-7\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}7\\\\-3\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}8\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}11\\\\-9\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}6\\\\-5\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}7\\\\-2\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<\/ol>\n<p><strong>Answers to Exercise 6<\/strong><\/p>\n<ol class=\"threecolumn\" type=\"a\">\n<li>4<\/li>\n<li>6<\/li>\n<li>1<\/li>\n<li>5<\/li>\n<li>7<\/li>\n<li>6<\/li>\n<li>2<\/li>\n<li>4<\/li>\n<li>4<\/li>\n<li>2<\/li>\n<li>4<\/li>\n<li>5<\/li>\n<\/ol>\n<\/div>\n<\/div>\n<div class=\"textbox textbox--exercises\">\n<header class=\"textbox__header\">\n<p class=\"textbox__title\">Exercise 7<\/p>\n<\/header>\n<div class=\"textbox__content\">\n<ol class=\"threecolumn\" type=\"a\">\n<li>[latex]\\begin{align*}13\\\\-5\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}10\\\\-1\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}9\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}5\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}9\\\\-9\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}16\\\\-8\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}11\\\\-7\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}6\\\\-3\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}18\\\\-9\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}7\\\\-2\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}13\\\\-7\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}8\\\\-6\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<\/ol>\n<p><strong>Answers to Exercise 7<\/strong><\/p>\n<ol class=\"threecolumn\" type=\"a\">\n<li>8<\/li>\n<li>9<\/li>\n<li>5<\/li>\n<li>1<\/li>\n<li>0<\/li>\n<li>8<\/li>\n<li>4<\/li>\n<li>3<\/li>\n<li>9<\/li>\n<li>5<\/li>\n<li>6<\/li>\n<li>2<\/li>\n<\/ol>\n<\/div>\n<\/div>\n<p>Practice your subtraction facts using dominoes. Place all the dominoes face down.<\/p>\n<div class=\"textbox textbox--exercises\">\n<header class=\"textbox__header\">\n<p class=\"textbox__title\">Exercise 8<\/p>\n<\/header>\n<div class=\"textbox__content\">\n<ol class=\"threecolumn\" type=\"a\">\n<li>[latex]\\begin{align*}12\\\\-3\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}6\\\\-2\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}10\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}11\\\\-9\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}1\\\\-0\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}8\\\\-1\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}12\\\\-5\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}11\\\\-2\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}3\\\\-2\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}11\\\\-8\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}14\\\\-7\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}8\\\\-3\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}15\\\\-9\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}9\\\\-7\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}7\\\\-1\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}11\\\\-5\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<\/ol>\n<p><strong>Answers to Exercise 8<\/strong><\/p>\n<ol class=\"threecolumn\" type=\"a\">\n<li>9<\/li>\n<li>4<\/li>\n<li>6<\/li>\n<li>2<\/li>\n<li>1<\/li>\n<li>7<\/li>\n<li>7<\/li>\n<li>9<\/li>\n<li>1<\/li>\n<li>3<\/li>\n<li>7<\/li>\n<li>5<\/li>\n<li>6<\/li>\n<li>2<\/li>\n<li>6<\/li>\n<li>6<\/li>\n<\/ol>\n<\/div>\n<\/div>\n<div class=\"textbox textbox--examples\">\n<header class=\"textbox__header\">\n<p class=\"textbox__title\">Need some extra practice?<\/p>\n<\/header>\n<div class=\"textbox__content\">\n<ul>\n<li>Find a partner and play this card game.<\/li>\n<li>Using a regular deck of cards, a jack will be eleven, a queen will be twelve and a king will be thirteen.<\/li>\n<li>Shuffle the cards and deal them out. Keep your cards in a pile in front of you.<\/li>\n<li>Each player flips over a card.<\/li>\n<li>Take turns subtracting the numbers on the cards. If the person gets the right answer that person gets to keep the cards. If the person get the wrong answer the other player gets the cards.<\/li>\n<li>The person who collects all the cards is the winner.<\/li>\n<li>You could also set a time limit and the person with the most cards when time is up is the winner.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<h1>Subtracting Across<\/h1>\n<p>So far you have only been subtracting numbers when they are <strong>up and down <\/strong>or <strong>vertical.<\/strong><\/p>\n<p><strong>Example:<\/strong><\/p>\n<p style=\"text-align: center\">[latex]\\begin{align*}9\\\\-5\\\\ \\hline 4 \\end{align*}[\/latex]<\/p>\n<p>Another way to subtract numbers is <strong>across <\/strong>or <strong>horizontally.<\/strong><\/p>\n<p style=\"text-align: center\">9 \u2212 5 = 4<\/p>\n<p>When you subtract numbers across, you work from left to right.<\/p>\n<div class=\"textbox textbox--exercises\">\n<header class=\"textbox__header\">\n<p class=\"textbox__title\">Exercise 9<\/p>\n<\/header>\n<div class=\"textbox__content\">\n<p>Practice subtracting across or horizontally. Check your work using the answer key at the end of the exercise.<\/p>\n<ol class=\"twocolumn\" type=\"a\">\n<li>6 \u2212 3 =<\/li>\n<li>12 \u2212 8 =<\/li>\n<li>4 \u2212 1 =<\/li>\n<li>8 \u2212 6 =<\/li>\n<li>18 \u2212 9 =<\/li>\n<li>11 \u2212 4 =<\/li>\n<li>7 \u2212 2 =<\/li>\n<li>16 \u2212 7 =<\/li>\n<li>10 \u2212 5 =<\/li>\n<li>2 \u2212 0 =<\/li>\n<li>9 \u2212 5 =<\/li>\n<li>17 \u2212 8 =<\/li>\n<\/ol>\n<p><strong>Answers to Exercise 9<\/strong><\/p>\n<ol class=\"twocolumn\" type=\"a\">\n<li>3<\/li>\n<li>4<\/li>\n<li>3<\/li>\n<li>2<\/li>\n<li>9<\/li>\n<li>7<\/li>\n<li>5<\/li>\n<li>9<\/li>\n<li>5<\/li>\n<li>2<\/li>\n<li>4<\/li>\n<li>9<\/li>\n<\/ol>\n<\/div>\n<\/div>\n<div class=\"textbox textbox--exercises\">\n<header class=\"textbox__header\">\n<p class=\"textbox__title\">Exercise 10<\/p>\n<\/header>\n<div class=\"textbox__content\">\n<p>Practice subtracting across or horizontally. Check your work using the answer key at the end of the exercise.<\/p>\n<ol class=\"twocolumn\" type=\"a\">\n<li>9 \u2212 6 =<\/li>\n<li>14 \u2212 5 =<\/li>\n<li>8 \u2212 4 =<\/li>\n<li>7 \u2212 1 =<\/li>\n<li>11 \u2212 7 =<\/li>\n<li>5 \u2212 0 =<\/li>\n<li>4 \u2212 3 =<\/li>\n<li>15 \u2212 8 =<\/li>\n<li>11 \u2212 9 =<\/li>\n<li>10 \u2212 2 =<\/li>\n<li>9 \u2212 2 =<\/li>\n<li>8 \u2212 3 =<\/li>\n<\/ol>\n<p><strong>Answers to Exercise 10<\/strong><\/p>\n<ol class=\"twocolumn\" type=\"a\">\n<li>3<\/li>\n<li>9<\/li>\n<li>4<\/li>\n<li>6<\/li>\n<li>4<\/li>\n<li>5<\/li>\n<li>1<\/li>\n<li>7<\/li>\n<li>2<\/li>\n<li>8<\/li>\n<li>7<\/li>\n<li>5<\/li>\n<\/ol>\n<\/div>\n<\/div>\n<div class=\"textbox textbox--exercises\">\n<header class=\"textbox__header\">\n<p class=\"textbox__title\">Exercise 11<\/p>\n<\/header>\n<div class=\"textbox__content\">\n<p>Practice subtracting across or horizontally. Check your work using the answer key at the end of the exercise.<\/p>\n<ol class=\"twocolumn\" type=\"a\">\n<li>3 \u2212 2 =<\/li>\n<li>17 \u2212 9 =<\/li>\n<li>14 \u2212 7 =<\/li>\n<li>9 \u2212 3 =<\/li>\n<li>12 \u2212 5 =<\/li>\n<li>8 \u2212 8 =<\/li>\n<li>6 \u2212 1 =<\/li>\n<li>13 \u2212 4 =<\/li>\n<li>11 \u2212 6 =<\/li>\n<li>4 \u2212 0 =<\/li>\n<li>8 \u2212 1 =<\/li>\n<li>16 \u2212 9 =<\/li>\n<li>7 \u2212 0 =<\/li>\n<li>13 \u2212 8 =<\/li>\n<li>12 \u2212 3 =<\/li>\n<li>9 \u2212 4 =<\/li>\n<li>15 \u2212 7 =<\/li>\n<li>10 \u2212 6 =<\/li>\n<li>11 \u2212 5 =<\/li>\n<li>5 \u2212 2 =<\/li>\n<\/ol>\n<p><strong>Answers to Exercise 11<\/strong><\/p>\n<ol class=\"twocolumn\" type=\"a\">\n<li>1<\/li>\n<li>8<\/li>\n<li>7<\/li>\n<li>6<\/li>\n<li>7<\/li>\n<li>0<\/li>\n<li>5<\/li>\n<li>9<\/li>\n<li>5<\/li>\n<li>4<\/li>\n<li>7<\/li>\n<li>7<\/li>\n<li>7<\/li>\n<li>5<\/li>\n<li>9<\/li>\n<li>5<\/li>\n<li>8<\/li>\n<li>4<\/li>\n<li>6<\/li>\n<li>3<\/li>\n<\/ol>\n<\/div>\n<\/div>\n<h1>Word Problems<\/h1>\n<p>Learning subtraction facts is very important because once you know them all they become a tool to use when solving problems.<\/p>\n<p>Words such as:<\/p>\n<ul>\n<li>less than<\/li>\n<li>minus<\/li>\n<li>subtracted from<\/li>\n<li>how many more<\/li>\n<li>how much more, and<\/li>\n<li>difference<\/li>\n<\/ul>\n<p>tell you to subtract the numbers.<\/p>\n<p>Look for these words when reading word problems and <span style=\"text-decoration: underline\">underline them<\/span> before trying to solve a problem. <span style=\"border: 1px solid;border-radius: 25px;padding: 2px 2px 2px 2px\">Circle<\/span> the information that is given.<\/p>\n<p><strong>Example: <\/strong><\/p>\n<p>There were 14 nails in a box. Lu used 7 of them. How many nails were still in the box?<\/p>\n<p>There were <span style=\"border: 1px solid;border-radius: 25px;padding: 2px 2px 2px 2px\">14 nails<\/span> in a box. Lu <span style=\"border: 1px solid;border-radius: 25px;padding: 2px 2px 2px 2px\">used 7<\/span> of them. <span style=\"text-decoration: underline\">How many<\/span> nails were still in the box?<\/p>\n<p>You have circled 14 nails and 7. This is the information you will use to find the answer.<\/p>\n<p>You have underlined \u201chow many\u201d. These words tell you to subtract.<\/p>\n<p style=\"text-align: center\">[latex]\\begin{align*} 14 \\text{ nails} \\\\ -7 \\text{ nails} \\\\ \\hline 7 \\text{ nails} \\end{align*}[\/latex]<\/p>\n<div class=\"textbox textbox--exercises\">\n<header class=\"textbox__header\">\n<p class=\"textbox__title\">Exercise 12<\/p>\n<\/header>\n<div class=\"textbox__content\">\n<ol type=\"a\">\n<li>Wolfgang walked 11 blocks. Ingrid walked 6 blocks. Wolfgang walked how much farther than Ingrid?<\/li>\n<li>Mika and her father went fishing. Mika caught 18 fish and her father caught 9 fish. How many more fish did Mika catch?<\/li>\n<li>Kuan-Lin was making moon cakes for the class party. She needed 15 cakes for the party. On Monday she had made 7 moon cakes. How many moon cakes did she still need to make?<\/li>\n<li>Malik counted 12 cars in the parking lot where he worked. One hour later, he counted only 4 cars. How many cars left?<\/li>\n<\/ol>\n<p><strong>Answers to Exercise 12<\/strong><\/p>\n<ol class=\"twocolumn\" type=\"a\">\n<li>5 blocks<\/li>\n<li>9 fish<\/li>\n<li>8 moon cakes<\/li>\n<li>8 cars<\/li>\n<\/ol>\n<\/div>\n<\/div>\n<h1>Topic A Self-Test<\/h1>\n<p><strong>Mark \/21 Aim 18\/27<\/strong><\/p>\n<ol type=\"A\">\n<li>Find the difference. Be sure to check your answers. (9 marks)\n<ol class=\"threecolumn\" type=\"a\">\n<li>[latex]\\begin{align*}16\\\\-8\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}18\\\\-9\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}14\\\\-8\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}11\\\\-4\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}9\\\\-3\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}17\\\\-9\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}10\\\\-6\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}7\\\\-5\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}15\\\\-6\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<\/ol>\n<\/li>\n<li>Find the difference. Be sure to check your answers. (6 marks)\n<ol class=\"threecolumn\" type=\"a\">\n<li>3 \u2212 2 =<\/li>\n<li>17 \u2212 9 =<\/li>\n<li>14 \u2212 7 =<\/li>\n<li>9 \u2212 3 =<\/li>\n<li>12 \u2212 5 =<\/li>\n<li>8 \u2212 8 =<\/li>\n<\/ol>\n<\/li>\n<li>Solve each of the following word problems. Be sure to include the unit of measure in your answer. Be sure to <span style=\"border: 1px solid;border-radius: 25px;padding: 2px 2px 2px 2px\">circle<\/span> the information and <span style=\"text-decoration: underline\">underline<\/span> what&#8217;s being asked.(6 marks, 2 marks each)\n<ol type=\"a\">\n<li>Shada caught 17 fish. She gave 8 fish to her grandmother. How many fish did she have left?<\/li>\n<li>Yuan went to the store with $15 to buy some rice. The rice cost $6. How much did he have left?<\/li>\n<li>Carlo had 13 metres of fencing. He used 8 metres around his flower garden. How many metres did he have left?<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<p><strong>Answers to Topic A Self-Test<\/strong><\/p>\n<ol type=\"A\">\n<li>\n<ol class=\"threecolumn\" type=\"a\">\n<li>8<\/li>\n<li>9<\/li>\n<li>6<\/li>\n<li>7<\/li>\n<li>6<\/li>\n<li>8<\/li>\n<li>4<\/li>\n<li>2<\/li>\n<li>9<\/li>\n<\/ol>\n<\/li>\n<li>\n<ol class=\"threecolumn\" type=\"a\">\n<li>1<\/li>\n<li>8<\/li>\n<li>7<\/li>\n<li>6<\/li>\n<li>7<\/li>\n<li>0<\/li>\n<\/ol>\n<\/li>\n<li>\n<ol class=\"threecolumn\" type=\"a\">\n<li>9 fish<\/li>\n<li>$9<\/li>\n<li>5 metres<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n","protected":false},"author":999,"menu_order":1,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"chapter-type":[],"contributor":[],"license":[],"class_list":["post-107","chapter","type-chapter","status-publish","hentry"],"part":105,"_links":{"self":[{"href":"https:\/\/pressbooks.bccampus.ca\/math021\/wp-json\/pressbooks\/v2\/chapters\/107","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pressbooks.bccampus.ca\/math021\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/pressbooks.bccampus.ca\/math021\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/math021\/wp-json\/wp\/v2\/users\/999"}],"version-history":[{"count":3,"href":"https:\/\/pressbooks.bccampus.ca\/math021\/wp-json\/pressbooks\/v2\/chapters\/107\/revisions"}],"predecessor-version":[{"id":181,"href":"https:\/\/pressbooks.bccampus.ca\/math021\/wp-json\/pressbooks\/v2\/chapters\/107\/revisions\/181"}],"part":[{"href":"https:\/\/pressbooks.bccampus.ca\/math021\/wp-json\/pressbooks\/v2\/parts\/105"}],"metadata":[{"href":"https:\/\/pressbooks.bccampus.ca\/math021\/wp-json\/pressbooks\/v2\/chapters\/107\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/pressbooks.bccampus.ca\/math021\/wp-json\/wp\/v2\/media?parent=107"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/math021\/wp-json\/pressbooks\/v2\/chapter-type?post=107"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/math021\/wp-json\/wp\/v2\/contributor?post=107"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/math021\/wp-json\/wp\/v2\/license?post=107"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}