An estimate may be appropriate when a more precise calculation is not possible or would require too much in time or other resources for the value of the answer that might be obtained.
When doing school work, however, it is only appropriate to estimate an answer when doing so is part of the process being taught at the time.
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It is - if you use appropriate rounding. Rounding does not have to be to whole numbers.
Estimating one of them is equivalent to estimating the other.
No, it is not. Estimating may be rounding but need not be.
No. Measuring is getting an exact length. Estimating is guessing what the length is
One strategy is estimating the factors the other i don't know