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how do you multiply and estimate to make sure your answer reasonable

Well I know how to multiply I just don't know how to estimate to get to my reasonable answer and some questions also use parentisis so does that mean I have another step to do.


The process of estimation is dependent on the operation (add, subtract, multiply, divide, etc. and the data presented.
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2 Answers

"some questions also use parentisis"
parentheses are used to indicate multiplication, as in 3(4) = 12
or in algebra as, for example, to explain the distributive property: a(b+c) = ab + ac.
298(31) can be ESTIMATED AS 300(30), which you can do mentally--approximately 9,000.
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