Take the Right Angle

Problem | Teachers' Notes | Hint | Solution | Printable page |
Stage: 2 Challenge Level: Challenge Level:1

Why do this problem?

This problem is one which could be done as an introduction when extending or revising work on time and clocks. It will encourage the use of digital times.

Key questions

At what time is the first right angle after $12$ o'clock?

Why is it not just $15$ minutes later?

Can you write down these times using digital notation?

Why is the number of times not divisible by $4$?

Possible extension

Learners could find out the times for $24$ hours and record using $24$ hour digital notation.

Possible support

Suggest counting round a clock, or using the interactive clock in the question.

Published March 2003,April 2003.