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Basic multiplication | Multiplication and division | Arithmetic | Khan Academy

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How to square any numbers in your head - fast mental math trick

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Learn how you can square large numbers in your head - instantly! This easy to learn technique will have you calculating the square of numbers up to 100 - without the need for a calculator. The trick is easy - first we find the distance from the number being squared to the nearest tens number.

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What Are Square Numbers | Numbers | Maths | FuseSchool