Further rounding to 10 or 100

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

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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?

More rounding numbers to the nearest whole ten.

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

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