An estimate of a quantity up to 1,000 is a nearby, useful amount rather than an exact count, determined by place value and familiar benchmarks. Numbers and collections can be compared with tens and hundreds on a number line or in grouped representations to decide whether they are closer to one benchmark than another; estimates need not be exact, while larger numbers, finer precision, and formal error bounds are outside this scope.
An estimate is a close, useful number—not the exact amount. To estimate to the nearest hundred, compare the number with nearby hundreds.
Example: A library has books. About how many books is that?
Since is less than , it is closer to than to .
So, books is about
The estimate is , but the exact number is .
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