Modular Arithmetic Lesson
The following is an adaptation from a lesson, Clock Arithmetic, by Dr. Susan Addington.
Investigate a 12 hour clock
 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.)
 What are the numbers on the clock?
 Find the standard names for these numbers on a 12hour 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
 Check your answers here.
Investigate a 10 hour clock
 Investigate a 10 hour clock.
 Answer the questions on the page.
 Check your answers.
Investigate a 2 hour clock
 Investigate a 2 hour clock.
 Answer the questions on the page.
 Check your answers.
