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You measure a desk with your hand span. A hand span is the width of your open hand. A friend gets a different number.

This track follows your book's Chapter 5, Measurement of Length and Motion.

What you will do

• Measure with a unit everyone shares.
• Pick the right unit: millimetre, centimetre, metre or kilometre.
• Read a ruler from two marks.
• Measure a curve with a thread.
• Find out if something has moved.
• Name the shape of a path.

Try each idea with your hands first.