Math is all about practice. So what a person have to do in math is to keep practicing and do not think about the answer before starting a math problem. Just use the rules and formulas and apply them, what u get at last is the answer. So have no fear.
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Just break apart your numbers or use a calculater.
how to do mental math useing propertys
You could break down the corresponding elements. So you could add the 600 and the 200 giving 800. You could then add the 90 and the 2, giving 92. Then add the 800 and the 92, giving 892.
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.