Answers to 10-hour clock questions

To find the standard name of a positive number, use only the ones digit. For negative numbers, do the same to get a negative number, then add 10.
Example: -37 = -7 = -7 + 10 = 3 (mod 10).

Answers to addition and subtraction questions.

  1. 2
  2. 2
  3. 2
  4. 5
  5. 8
  6. 6
  7. 6
  8. 2
  9. 8
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ithmetic page.