{"id":109,"date":"2021-01-21T19:24:01","date_gmt":"2021-01-22T00:24:01","guid":{"rendered":"https:\/\/pressbooks.bccampus.ca\/math021\/chapter\/subtraction-of-larger-numbers\/"},"modified":"2025-07-09T18:18:08","modified_gmt":"2025-07-09T22:18:08","slug":"subtraction-of-larger-numbers","status":"publish","type":"chapter","link":"https:\/\/pressbooks.bccampus.ca\/math021\/chapter\/subtraction-of-larger-numbers\/","title":{"raw":"Topic B: Subtraction of Larger Numbers","rendered":"Topic B: Subtraction of Larger Numbers"},"content":{"raw":"You can find the difference between two large numbers using the basic subtraction facts you have been practicing. Always <strong>take away <\/strong>or subtract the <strong>number after the minus sign.<\/strong>\r\n\r\nUse these steps to complete each subtraction question.\r\n<ol>\r\n \t<li>Subtract the ones from the ones.<\/li>\r\n \t<li>Subtract the tens from the tens.<\/li>\r\n \t<li>Subtract the hundreds from the hundreds.<\/li>\r\n<\/ol>\r\n<strong>Example A:<\/strong>\r\n<p style=\"text-align: center\">[latex]\\begin{align*}57\\\\-26\\\\ \\hline \\\\ \\end{align*}[\/latex]<\/p>\r\n\r\n<ol>\r\n \t<li>Subtract the ones from the ones. 7 ones \u2212 6 ones = 1 one. Write the answer in line with the ones in the question.\r\n[latex]\\begin{align*}57\\\\-26\\\\ \\hline 1 \\end{align*}[\/latex]<\/li>\r\n \t<li>Subtract the tens from the tens. 5 tens \u2013 2 tens = 3 tens\r\n[latex]\\begin{align*}57\\\\-26\\\\ \\hline 31 \\end{align*}[\/latex]<\/li>\r\n<\/ol>\r\nThe <strong>difference <\/strong>between 57 and 26 is <strong>31<\/strong>.\r\n\r\n<strong>Example B:<\/strong>\r\n<p style=\"text-align: center\">[latex]\\begin{align*}628\\\\-524\\\\ \\hline \\\\ \\end{align*}[\/latex]<\/p>\r\n\r\n<ol>\r\n \t<li>Subtract the ones from the ones. 8 ones \u2013 4 ones = 4 ones. Write the answer in line with the ones in the question.\r\n[latex]\\begin{align*}628\\\\-524\\\\ \\hline 4 \\end{align*}[\/latex]<\/li>\r\n \t<li>Subtract the tens. 2 tens \u2013 2 tens = 0 tens.\r\n[latex]\\begin{align*}628\\\\-524\\\\ \\hline 04 \\end{align*}[\/latex]<\/li>\r\n \t<li>Subtract the hundreds. 6 hundreds \u2013 5 hundreds = 1 hundred.\r\n[latex]\\begin{align*}628\\\\-524\\\\ \\hline 104 \\end{align*}[\/latex]<\/li>\r\n<\/ol>\r\nWrite the answer in line with the hundreds in the question. The <strong>difference <\/strong>between 628 and 524 is <strong>104<\/strong>.\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\nFind the differences. Check your work using the answer key at the end of the exercise.\r\n<ol class=\"threecolumn\" type=\"a\">\r\n \t<li>[latex]\\begin{align*}87\\\\-36\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}29\\\\-21\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}48\\\\-40\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}99\\\\-63\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}75\\\\-45\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}73\\\\-20\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}92\\\\-21\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}58\\\\-27\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}84\\\\-23\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}69\\\\-38\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}45\\\\-23\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}49\\\\-19\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}59\\\\-14\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}87\\\\-63\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}88\\\\-15\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}56\\\\-44\\\\ \\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>51<\/li>\r\n \t<li>8<\/li>\r\n \t<li>8<\/li>\r\n \t<li>36<\/li>\r\n \t<li>30<\/li>\r\n \t<li>53<\/li>\r\n \t<li>71<\/li>\r\n \t<li>31<\/li>\r\n \t<li>61<\/li>\r\n \t<li>31<\/li>\r\n \t<li>22<\/li>\r\n \t<li>30<\/li>\r\n \t<li>45<\/li>\r\n \t<li>24<\/li>\r\n \t<li>73<\/li>\r\n \t<li>12<\/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\r\nFind the differences. Check your work using the answer key at the end of the exercise.\r\n<ol class=\"threecolumn\" type=\"a\">\r\n \t<li>[latex]\\begin{align*}46\\\\-23\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}65\\\\-42\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}45\\\\-13\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}53\\\\-20\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}34\\\\-21\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}48\\\\-32\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}56\\\\-13\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}26\\\\-15\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}49\\\\-22\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}58\\\\-27\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}95\\\\-71\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}89\\\\-14\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}69\\\\-19\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}86\\\\-71\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}99\\\\-50\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}89\\\\-55\\\\ \\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>23<\/li>\r\n \t<li>23<\/li>\r\n \t<li>32<\/li>\r\n \t<li>33<\/li>\r\n \t<li>13<\/li>\r\n \t<li>16<\/li>\r\n \t<li>43<\/li>\r\n \t<li>11<\/li>\r\n \t<li>27<\/li>\r\n \t<li>31<\/li>\r\n \t<li>24<\/li>\r\n \t<li>75<\/li>\r\n \t<li>50<\/li>\r\n \t<li>15<\/li>\r\n \t<li>49<\/li>\r\n \t<li>34<\/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\r\nFind the differences. Check your work using the answer key at the end of the exercise.\r\n<ol class=\"threecolumn\" type=\"a\">\r\n \t<li>[latex]\\begin{align*}23\\\\-11\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}53\\\\-21\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}32\\\\-20\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}77\\\\-32\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}32\\\\-21\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}38\\\\-15\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}33\\\\-13\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}92\\\\-30\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}94\\\\-23\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}54\\\\-42\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}74\\\\-33\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}88\\\\-72\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}46\\\\-36\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}75\\\\-41\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}85\\\\-12\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}56\\\\-45\\\\ \\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>12<\/li>\r\n \t<li>32<\/li>\r\n \t<li>12<\/li>\r\n \t<li>45<\/li>\r\n \t<li>11<\/li>\r\n \t<li>23<\/li>\r\n \t<li>20<\/li>\r\n \t<li>62<\/li>\r\n \t<li>71<\/li>\r\n \t<li>12<\/li>\r\n \t<li>41<\/li>\r\n \t<li>16<\/li>\r\n \t<li>10<\/li>\r\n \t<li>34<\/li>\r\n \t<li>73<\/li>\r\n \t<li>11<\/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\r\nFind the differences. Check your work using the answer key at the end of the exercise.\r\n<ol class=\"threecolumn\" type=\"a\">\r\n \t<li>[latex]\\begin{align*}476\\\\-413\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}873\\\\-560\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}589\\\\-384\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}793\\\\-170\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}228\\\\-123\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}995\\\\-452\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}869\\\\-423\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}769\\\\-405\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}788\\\\-435\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}579\\\\-234\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}958\\\\-403\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}696\\\\-251\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}657\\\\-435\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}745\\\\-412\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}967\\\\-143\\\\ \\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>63<\/li>\r\n \t<li>313<\/li>\r\n \t<li>205<\/li>\r\n \t<li>623<\/li>\r\n \t<li>105<\/li>\r\n \t<li>543<\/li>\r\n \t<li>446<\/li>\r\n \t<li>364<\/li>\r\n \t<li>353<\/li>\r\n \t<li>345<\/li>\r\n \t<li>555<\/li>\r\n \t<li>445<\/li>\r\n \t<li>222<\/li>\r\n \t<li>333<\/li>\r\n \t<li>824<\/li>\r\n<\/ol>\r\n<\/div>\r\n<\/div>\r\n<h1>Topic B Self-Test<\/h1>\r\n<strong>Mark \/27 Aim 23\/27<\/strong>\r\n<ol type=\"A\">\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>[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<\/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>[latex]\\begin{align*}896\\\\-422\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}788\\\\-531\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}549\\\\-318\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}936\\\\-702\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}936\\\\-725\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\r\n \t<li>[latex]\\begin{align*}654\\\\-242\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/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>At noon the temperature was 34 degrees Celsius. At nine o\u2019clock in the evening, it was 12 degrees Celsius. How many degrees did the temperature drop?<\/li>\r\n \t<li>Misha\u2019s family is on a 179 kilometer trip. They have already gone 123 kilometers. How much farther to they have to go?<\/li>\r\n \t<li>The Burj Khalifa in Dubai is one of the tallest buildings in the world at 828 metres. The Eiffel Tower in Paris is 324 metres tall. How much taller is the Burj Khalifa than the Eiffel Tower?<\/li>\r\n<\/ol>\r\n<\/li>\r\n<\/ol>\r\n<strong>Answers to Topic B Self Test<\/strong>\r\n<ol>\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<\/ol>\r\n<\/li>\r\n \t<li>\r\n<ol class=\"threecolumn\" type=\"a\">\r\n \t<li>474<\/li>\r\n \t<li>257<\/li>\r\n \t<li>231<\/li>\r\n \t<li>234<\/li>\r\n \t<li>211<\/li>\r\n \t<li>412<\/li>\r\n<\/ol>\r\n<\/li>\r\n \t<li>\r\n<ol class=\"threecolumn\" type=\"a\">\r\n \t<li>22 degrees Celsius<\/li>\r\n \t<li>56 kilometres<\/li>\r\n \t<li>504 metres<\/li>\r\n<\/ol>\r\n<\/li>\r\n<\/ol>","rendered":"<p>You can find the difference between two large numbers using the basic subtraction facts you have been practicing. Always <strong>take away <\/strong>or subtract the <strong>number after the minus sign.<\/strong><\/p>\n<p>Use these steps to complete each subtraction question.<\/p>\n<ol>\n<li>Subtract the ones from the ones.<\/li>\n<li>Subtract the tens from the tens.<\/li>\n<li>Subtract the hundreds from the hundreds.<\/li>\n<\/ol>\n<p><strong>Example A:<\/strong><\/p>\n<p style=\"text-align: center\">[latex]\\begin{align*}57\\\\-26\\\\ \\hline \\\\ \\end{align*}[\/latex]<\/p>\n<ol>\n<li>Subtract the ones from the ones. 7 ones \u2212 6 ones = 1 one. Write the answer in line with the ones in the question.<br \/>\n[latex]\\begin{align*}57\\\\-26\\\\ \\hline 1 \\end{align*}[\/latex]<\/li>\n<li>Subtract the tens from the tens. 5 tens \u2013 2 tens = 3 tens<br \/>\n[latex]\\begin{align*}57\\\\-26\\\\ \\hline 31 \\end{align*}[\/latex]<\/li>\n<\/ol>\n<p>The <strong>difference <\/strong>between 57 and 26 is <strong>31<\/strong>.<\/p>\n<p><strong>Example B:<\/strong><\/p>\n<p style=\"text-align: center\">[latex]\\begin{align*}628\\\\-524\\\\ \\hline \\\\ \\end{align*}[\/latex]<\/p>\n<ol>\n<li>Subtract the ones from the ones. 8 ones \u2013 4 ones = 4 ones. Write the answer in line with the ones in the question.<br \/>\n[latex]\\begin{align*}628\\\\-524\\\\ \\hline 4 \\end{align*}[\/latex]<\/li>\n<li>Subtract the tens. 2 tens \u2013 2 tens = 0 tens.<br \/>\n[latex]\\begin{align*}628\\\\-524\\\\ \\hline 04 \\end{align*}[\/latex]<\/li>\n<li>Subtract the hundreds. 6 hundreds \u2013 5 hundreds = 1 hundred.<br \/>\n[latex]\\begin{align*}628\\\\-524\\\\ \\hline 104 \\end{align*}[\/latex]<\/li>\n<\/ol>\n<p>Write the answer in line with the hundreds in the question. The <strong>difference <\/strong>between 628 and 524 is <strong>104<\/strong>.<\/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>Find the differences. Check your work using the answer key at the end of the exercise.<\/p>\n<ol class=\"threecolumn\" type=\"a\">\n<li>[latex]\\begin{align*}87\\\\-36\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}29\\\\-21\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}48\\\\-40\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}99\\\\-63\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}75\\\\-45\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}73\\\\-20\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}92\\\\-21\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}58\\\\-27\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}84\\\\-23\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}69\\\\-38\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}45\\\\-23\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}49\\\\-19\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}59\\\\-14\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}87\\\\-63\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}88\\\\-15\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}56\\\\-44\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<\/ol>\n<p><strong>Answers to Exercise 1<\/strong><\/p>\n<ol class=\"threecolumn\" type=\"a\">\n<li>51<\/li>\n<li>8<\/li>\n<li>8<\/li>\n<li>36<\/li>\n<li>30<\/li>\n<li>53<\/li>\n<li>71<\/li>\n<li>31<\/li>\n<li>61<\/li>\n<li>31<\/li>\n<li>22<\/li>\n<li>30<\/li>\n<li>45<\/li>\n<li>24<\/li>\n<li>73<\/li>\n<li>12<\/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<p>Find the differences. Check your work using the answer key at the end of the exercise.<\/p>\n<ol class=\"threecolumn\" type=\"a\">\n<li>[latex]\\begin{align*}46\\\\-23\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}65\\\\-42\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}45\\\\-13\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}53\\\\-20\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}34\\\\-21\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}48\\\\-32\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}56\\\\-13\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}26\\\\-15\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}49\\\\-22\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}58\\\\-27\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}95\\\\-71\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}89\\\\-14\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}69\\\\-19\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}86\\\\-71\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}99\\\\-50\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}89\\\\-55\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<\/ol>\n<p><strong>Answers to Exercise 2<\/strong><\/p>\n<ol class=\"threecolumn\" type=\"a\">\n<li>23<\/li>\n<li>23<\/li>\n<li>32<\/li>\n<li>33<\/li>\n<li>13<\/li>\n<li>16<\/li>\n<li>43<\/li>\n<li>11<\/li>\n<li>27<\/li>\n<li>31<\/li>\n<li>24<\/li>\n<li>75<\/li>\n<li>50<\/li>\n<li>15<\/li>\n<li>49<\/li>\n<li>34<\/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<p>Find the differences. Check your work using the answer key at the end of the exercise.<\/p>\n<ol class=\"threecolumn\" type=\"a\">\n<li>[latex]\\begin{align*}23\\\\-11\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}53\\\\-21\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}32\\\\-20\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}77\\\\-32\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}32\\\\-21\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}38\\\\-15\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}33\\\\-13\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}92\\\\-30\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}94\\\\-23\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}54\\\\-42\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}74\\\\-33\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}88\\\\-72\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}46\\\\-36\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}75\\\\-41\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}85\\\\-12\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}56\\\\-45\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<\/ol>\n<p><strong>Answers to Exercise 3<\/strong><\/p>\n<ol class=\"threecolumn\" type=\"a\">\n<li>12<\/li>\n<li>32<\/li>\n<li>12<\/li>\n<li>45<\/li>\n<li>11<\/li>\n<li>23<\/li>\n<li>20<\/li>\n<li>62<\/li>\n<li>71<\/li>\n<li>12<\/li>\n<li>41<\/li>\n<li>16<\/li>\n<li>10<\/li>\n<li>34<\/li>\n<li>73<\/li>\n<li>11<\/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<p>Find the differences. Check your work using the answer key at the end of the exercise.<\/p>\n<ol class=\"threecolumn\" type=\"a\">\n<li>[latex]\\begin{align*}476\\\\-413\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}873\\\\-560\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}589\\\\-384\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}793\\\\-170\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}228\\\\-123\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}995\\\\-452\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}869\\\\-423\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}769\\\\-405\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}788\\\\-435\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}579\\\\-234\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}958\\\\-403\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}696\\\\-251\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}657\\\\-435\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}745\\\\-412\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}967\\\\-143\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<\/ol>\n<p><strong>Answers to Exercise 4<\/strong><\/p>\n<ol class=\"threecolumn\" type=\"a\">\n<li>63<\/li>\n<li>313<\/li>\n<li>205<\/li>\n<li>623<\/li>\n<li>105<\/li>\n<li>543<\/li>\n<li>446<\/li>\n<li>364<\/li>\n<li>353<\/li>\n<li>345<\/li>\n<li>555<\/li>\n<li>445<\/li>\n<li>222<\/li>\n<li>333<\/li>\n<li>824<\/li>\n<\/ol>\n<\/div>\n<\/div>\n<h1>Topic B Self-Test<\/h1>\n<p><strong>Mark \/27 Aim 23\/27<\/strong><\/p>\n<ol type=\"A\">\n<li>Find the difference. Be sure to check your answers. (6 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<\/ol>\n<\/li>\n<li>Find the difference. Be sure to check your answers. (6 marks)\n<ol class=\"threecolumn\" type=\"a\">\n<li>[latex]\\begin{align*}896\\\\-422\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}788\\\\-531\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}549\\\\-318\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}936\\\\-702\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}936\\\\-725\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/li>\n<li>[latex]\\begin{align*}654\\\\-242\\\\ \\hline\\\\ \\end{align*}[\/latex]<\/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>At noon the temperature was 34 degrees Celsius. At nine o\u2019clock in the evening, it was 12 degrees Celsius. How many degrees did the temperature drop?<\/li>\n<li>Misha\u2019s family is on a 179 kilometer trip. They have already gone 123 kilometers. How much farther to they have to go?<\/li>\n<li>The Burj Khalifa in Dubai is one of the tallest buildings in the world at 828 metres. The Eiffel Tower in Paris is 324 metres tall. How much taller is the Burj Khalifa than the Eiffel Tower?<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<p><strong>Answers to Topic B Self Test<\/strong><\/p>\n<ol>\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<\/ol>\n<\/li>\n<li>\n<ol class=\"threecolumn\" type=\"a\">\n<li>474<\/li>\n<li>257<\/li>\n<li>231<\/li>\n<li>234<\/li>\n<li>211<\/li>\n<li>412<\/li>\n<\/ol>\n<\/li>\n<li>\n<ol class=\"threecolumn\" type=\"a\">\n<li>22 degrees Celsius<\/li>\n<li>56 kilometres<\/li>\n<li>504 metres<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n","protected":false},"author":999,"menu_order":8,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"chapter-type":[],"contributor":[],"license":[],"class_list":["post-109","chapter","type-chapter","status-publish","hentry"],"part":105,"_links":{"self":[{"href":"https:\/\/pressbooks.bccampus.ca\/math021\/wp-json\/pressbooks\/v2\/chapters\/109","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\/109\/revisions"}],"predecessor-version":[{"id":182,"href":"https:\/\/pressbooks.bccampus.ca\/math021\/wp-json\/pressbooks\/v2\/chapters\/109\/revisions\/182"}],"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\/109\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/pressbooks.bccampus.ca\/math021\/wp-json\/wp\/v2\/media?parent=109"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/math021\/wp-json\/pressbooks\/v2\/chapter-type?post=109"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/math021\/wp-json\/wp\/v2\/contributor?post=109"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/math021\/wp-json\/wp\/v2\/license?post=109"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}