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Mental Math

Your techniques across 5 families. Tap any to practise.

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0 / 23 techniques
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Add & Subtract · 0/4
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Number Bonds
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Left-to-Right
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Compensation
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Equal-Addition Balance
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Multiply & Divide · 0/3
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Factoring
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Gear Train (÷ by factors)
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Chunking Chopper
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Speed tricks · 0/11
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Doubling & Halving
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Multiply by 11
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Tens Match
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Difference of Squares
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Squaring Spree
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Divisibility Tests
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Power Multiply
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Mental Division
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Casting Out Nines
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Rule of 70
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Vertically & Crosswise
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Fractions, Decimals & % · 0/3
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Butterfly (add fractions)
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Percentage Swap
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Decimal Scaling
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Algebra & Logic · 0/2
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Algebra equation
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Missing digit
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