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

Math Topics
Addition & Subtraction, Quadratic Equations
High School
9th Grade, 10th Grade, 11th Grade

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NRICH (University of Cambridge)

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