Answer Key 1.7

  1. Solutions:
    1. 6 − 4 ≠ 4
    2. 5 + 4 = 9
    3. 0 + 4 = 4
    4. 8 − 4 = 4
  2. Are the following statements true?
    • Letters A, B, C & D do not appear anywhere in the spellings of 1 to 99.
      True — but also J, K, L, P, Q & Z.
    • Letter D appears for the first time in “hundred.”
      True.
    • Letters A, B & C do not appear anywhere in the spellings of 1 to 999.
      True.
    • Letter A appears for the first time in “thousand.”
      True.
    • Letters B & C do not appear anywhere in the spellings of 1 to 999 999 999.
      True.
    • Letter B appears for the first time in “billion.”
      True.
    • Letter C does not appear anywhere in any word used to count in English.
      False.

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