Estimation involves replacing numbers with nearby, easier values—often the nearest ten or hundred—to predict a reasonable sum or difference, then comparing that estimate with an exact answer for numbers within 1,000. The learner understands that an estimate is not usually the exact result and uses its size and place-value relationships to identify answers that are clearly unreasonable, building a foundation for checking calculations with larger numbers and other operations.
An estimate is a close, easier number that helps you decide whether an exact answer makes sense.
Example: Check the answer to
Round each number to the nearest hundred.
Add the rounded numbers.
So, the estimate is about .
The estimate does not have to be exact. It helps you notice answers that are far too large or far too small. For example, could not be because is much larger than the estimate of about .
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