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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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ABC

In the multiplication calculation, some of the digits have been replaced by letters and others by asterisks. Can you reconstruct the original multiplication?

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.