Rounding to give approximate answers

Rounding numbers helps to give a good approximation of an answer. Especially important when using calculators.

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Starting with blank 0-10 number lines and moving on to 0-100 number lines, how easy is it to place numbers accurately?

When rounding to the nearest hundred, look at the tens digit to decide what to do.

Rounding the lengths of bridges and rivers, or even birds' wingspans.

Estimating numbers up to 1,000.

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