Modular Arithmetic Lesson


The following is an adaptation from a lesson, Clock Arithmetic, by Dr. Susan Addington.

Investigate a 12 hour clock

  1. Look at the 12 hour clock here. Now answer these questions: (Go ahead and look back at the clock if you need to refer to it.)

  2. What are the numbers on the clock?

  3. Find the standard names for these numbers on a 12-hour clock. Try to find shortcuts to save work.
    1. 13
    2. 24
    3. -5
    4. -11
    5. 48
    6. 120
    7. 2457
    8. -34
    9. -763
  4. Check your answers here.

Investigate a 10 hour clock

  1. Investigate a 10 hour clock.

  2. Answer the questions on the page.

  3. Check your answers.

Investigate a 2 hour clock

  1. Investigate a 2 hour clock.

  2. Answer the questions on the page.

  3. Check your answers.


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