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Maths

Mental maths tricks, shortcuts and fast arithmetic methods.

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Mental Arithmetic7 tools

Reference & Checking3 tools

Mental Arithmetic

Mental Maths TricksFast, reliable ways to do everyday maths in your head, with simple steps and an explanation of why each method works.Fastest Mental Maths MethodEnter a simple calculation and see a reliable mental shortcut when one applies.Fast Multiplication TricksReliable shortcuts for common multiplication patterns.Fast Percentage TricksCalculate common percentages mentally and rearrange awkward ones into easier calculations.Fast Squaring TricksQuick methods for squaring numbers ending in 5 and numbers close to a convenient base.Fast Addition & SubtractionUse round numbers, compensation and complements to simplify mental arithmetic.Fast Division TricksTransform awkward divisions into easier equivalent calculations.

Reference & Checking

Divisibility TestsQuickly test a whole number against common mental divisibility rules.Common Fractions, Decimals & PercentagesThe useful fraction, decimal and percentage equivalents worth recognising instantly.Estimate & Check an AnswerUse rounding and order of magnitude to catch arithmetic mistakes quickly.