mental math means you do it in your head with out doing on a sheet of paper
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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.
how to do mental math useing propertys
Mental math is basically math in your head so for example 40x2=80 so I did that in my head
Mental Math Mostly
Mental math! aka in ur head