Yes, you do that first.
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7 + 9*(3-1) = 25
use parentheses when u do a opperation. Parentheses have to do 1st no matter what
An estimated math answer is one that is guessed based on what you know without actually doing the problem.
To clarify the order of operations in the math problem, you can use parentheses as follows: (3 times 42) plus (84 divide by 2) plus (2) equals 56.
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.