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Eight Dominoes

Using the 8 dominoes make a square where each of the columns and rows adds up to 8

Two and Two

How many solutions can you find to this sum? Each of the different letters stands for a different number.

Magic Squares

An account of some magic squares and their properties and and how to construct them for yourself.

Digit Sum

Age 14 to 16 Short Challenge Level:

What is the sum of all the digits in all the numbers from one to one million?
You can find more short problems, arranged by curriculum topic, in our short problems collection.