NRICH: Clever Calculation

Find the shortcut to do this calculation quickly!

Without using a calculator, or performing any long multiplication calculations, find the value of

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

Age 14 to 16

Addition & Subtraction, Quadratic Equations
High School

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NRICH (University of Cambridge)

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