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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?


Can you match the mass and length or height of these things to their pictures?

Measure for Measure

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

Measure Our Heights

Age 5 to 7 Challenge Level:
Does the height of your friend compared with your height make a difference?  Is it easier if you are taller or shorter than your friend, or can you come up with a method so that it does not matter?
What equipment do you need?