Estimation on a number line

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

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

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

Some more number sequences.

Estimating numbers up to 1,000.

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