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Number Detective

Follow the clues to find the mystery number.

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?


In the multiplication calculation, some of the digits have been replaced by letters and others by asterisks.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

Spell by Numbers

Age 7 to 11
Challenge Level

This was quite tricky but some of you made good solutions and told us how you worked them out.

Sarah from Tattingstone School said she started off with O because she could see that it left things unchanged. Here is her solution:

Sarah's solution.

Can you follow her description of what she did?

Here is another one from her friend Marion. She started with a different idea but still gets the solution. Is one way quicker than the other?

Marion's solution.