We measure how tall you are in centimetres and metres.
When a doctor checks your height, they stand you by a tall ruler. Little kids might be about 100 centimetres, which is the same as one metre.
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A ruler helps us measure how long or tall something is.
One metre is about as long as a big step or a baseball bat.
We use a scale to measure how heavy something is.
Long ago, people measured things using their own feet and hands.
The tallest tree is so big you'd need a very long tape to measure it.