Activity Description Work with various types of clocks in order to learn about modular arithmetic operations. Parameters: Number of hours on the clock.

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Clock Arithmetic

Place in mathematics curriculum:

This activity can be used to:

• practice students' long division skills
• motivate the ideas of modular arithmetic

This activity allows the user to experiment with clock (modular) arithmetic. This activity would work well in mixed ability groups of two or three for about thirty minutes if you use the exploration questions and fifteen minutes otherwise.

Preparations for this activity:

• explain that not all people use a twelve hour clock.
• explain some of the benefits of military time.