Maths
Mental maths tricks, shortcuts and fast arithmetic methods.
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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.FSFast Squaring TricksQuick methods for squaring numbers ending in 5 and numbers close to a convenient base.FAFast 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.ECEstimate & Check an AnswerUse rounding and order of magnitude to catch arithmetic mistakes quickly.