There are a number of reasons for why mental math is helpful in everyday life.
Academic Wise (and in many professions), mental math is even more important. Even with a calculator, computer models, etc. you will need to setup the problem or equation. And being able torecognizepatterns, that youestablisheddoing mental math for years, is, in some cases, the only way to setup the problem correctly.
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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
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.
Mental Math Mostly
Mental math! aka in ur head