Th see if your work matches your answer and vice-versa
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In math, check means to check your work by reversing the problem and making sure it works out.
Work hard, be careful and check your work.
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I think you are referring to checking a math equation. After you solve an equation you should go back and check your work to make sure you got the right answer. You can do this by plugging your answer back into the equation
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.