I like to think of estimating as the pickel in the middle. On the one hand you can guess; estimating is not guessing. If I ask you what 11 x 13 is and you pull a number out of the hat that is guessing.
One the other hand you can do the calculation; estimating is not being precise. If I ask you the same question and you calculate the answer that is not estimating.
Estimating is an educated guess. It is using what you know to get close to the answer. If you say, "11 x 13 is a little more than 10 x 13 = 130, so I estimate the answer is 140," that is estimating.
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