Exercises: Clock Arithmetic (Modular Arithmetic)

Work through each section in order. Picture a clock face for every add/subtract/multiply problem.

Grade 7·21 problems·~28 min·Uganda NCDC Primary 7 Mathematics·lesson·integers-02

Work through problems with immediate feedback

Recall / Warm-Up

On a straight number line (like a temperature scale), can you keep counting forward forever without returning to where you started?

No — it eventually loops back

Yes — a straight number line never loops back

How many positions are on a standard clock face (1 through 12)?

If you count forward from 10, what number comes right after 12?

$Clock face showing a forward count from 10 wrapping past 12 to land on 2$

Start at 10 on a clock and go forward 4. Where do you land?

Compute 9 + 5 on a 12-hour clock. Give the clock position (1-12).

Compute 3 − 7 on a 12-hour clock. Give the clock position (1-12).

Compute 11 + 6 on a 12-hour clock. Give the clock position (1-12).

Compute 4 × 5 on a 12-hour clock (repeated addition, then wrap). Give the clock position (1-12).

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