To estimate the sum is to guess what the answer is for an addition problem. For example, if it was 8 + 9 you would see what number 8 is close to (like ten) and do the same with number nine and your estimate would be 20.
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sum means addition so the sum of 5 and 2 will be 7
It means the sum of the angle measurements.
NO!!! Product means Mu;ltiply Sum means Addition (Add).
the answer to the addition problem