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2-digit Square

A 2-Digit number is squared. When this 2-digit number is reversed and squared, the difference between the squares is also a square. What is the 2-digit number?

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Consecutive Squares

The squares of any 8 consecutive numbers can be arranged into two sets of four numbers with the same sum. True of false?

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Plus Minus

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Length, Width and Area

Age 14 to 16 Short Challenge Level:

The area of a rectangle is 225 square units.

Its length is 16 more than its width.

Find its width.



This problem is taken from the World Mathematics Championships
You can find more short problems, arranged by curriculum topic, in our short problems collection.