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Number Detective

Follow the clues to find the mystery number.

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Six Is the Sum

What do the digits in the number fifteen add up to? How many other numbers have digits with the same total but no zeros?

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(w)holy Numbers

A church hymn book contains 700 hymns. The numbers of the hymns are displayed by combining special small single-digit boards. What is the minimum number of small boards that is needed?


Stage: 2 Challenge Level: Challenge Level:3 Challenge Level:3 Challenge Level:3

Why do this problem?

This activity is very good for exploring properties of odd (and even) numbers. It can provide an opportunity for pupils to show their skills in perseverance.

Key questions

What have you discovered so far?
Tell me about the numbers you've found.

Possible extension

Learners could explore even numbers and then compare their findings to the odd numbers. Can they explain the results?

Possible support

Many children will find it helpful to have calculators to hand.