No ,doing math in your head is called mental math ;which is only used if you were to be skip counting or any other thing's hopefully i answered it pretty good.
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It means that when somebody reads the work you did as you solved a math problem, they can see that you had a handle on what you were doing, and a reason for doing it the way you did it, and your approach to the solution didn't resemble the actions of a centipede being washed down the drain.
In math, check means to check your work by reversing the problem and making sure it works out.
0.0056 x 0.75 = 0.0042
-0.25
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.