mental math

1. (Canada, Philippines, US, uncountable, usually)Synonym of mental calculation (“arithmetical calculations using only the human brain, with no help from any supplies (such as pencil and paper) or devices such as a calculator”).

1. Tom is good at mental math.

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2. I need to do some mental math.

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3. He's good at mental math.

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4. Here are some tricks to help you do mental math.

   deHier sind ein paar Tricks, die dir beim Kopfrechnen helfen.

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5. Here are some tricks that can help you do mental math.

   deDie folgenden Tricks können einem beim Kopfrechnen helfen.

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