In math, check means to check your work by reversing the problem and making sure it works out.
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There is no such math word, so it does not mean anything. You may wish to check your spelling before posting questions!
50 what's "mental math" supposed to mean? if it just means you did it in your head, then there is no difference between mental and regular math, except that it is harder to check your work.
what does key mean in math
check answer
figure math means figure math