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In the multiplication calculation, some of the digits have been replaced by letters and others by asterisks.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

Song Book

Age 7 to 11
Challenge Level

What's the biggest number we're going to need?
What's the smallest?
Are there any numbers that we'll need more of/fewer of?
How could we record this?