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Hand Span

Use your hand span to measure the distance around a tree trunk. If you ask a friend to try the same thing, how do the answers compare?

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Measure for Measure

This article, written for students, looks at how some measuring units and devices were developed.

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Sizing Them Up

Can you put these shapes in order of size? Start with the smallest.


Stage: 1 Challenge Level: Challenge Level:1

Can you use your fingers to show how long 18mm is approximately? Which thing is about this length on the list?

How tall are you? How much do you weigh?