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Euler's Squares

Euler found four whole numbers such that the sum of any two of the numbers is a perfect square...

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Odd Differences

The diagram illustrates the formula: 1 + 3 + 5 + ... + (2n - 1) = n² Use the diagram to show that any odd number is the difference of two squares.

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Peeling the Apple or the Cone That Lost Its Head

How much peel does an apple have?

Dating Made Easier

Stage: 4 Challenge Level: Challenge Level:3 Challenge Level:3 Challenge Level:3

What would you need to multiply by to do the same job as calculating $10\%$ and then adding it on ?