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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?

Diagonal Sums

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

How do the numbers at the corners of the square compare with each other?
For example, what is the difference between the two numbers at the "top" corners of the square? And the difference between the two numbers at the "bottom" corners of the square?
You may like to print off this 100 square to try out some different squares of numbers.