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The blue whale is the biggest animal, longer than three school buses.

The blue whale is the biggest animal, longer than three school buses.

A blue whale can be about 30 metres long. If you lined up three school buses end to end, the whale would still be just as long!

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A ruler helps us measure how long or tall something is. A ruler helps us measure how long or tall something is. We measure how tall you are in centimetres and metres. We measure how tall you are in centimetres and metres. One metre is about as long as a big step or a baseball bat. One metre is about as long as a big step or a baseball bat. We use a scale to measure how heavy something is. We use a scale to measure how heavy something is. Long ago, people measured things using their own feet and hands. Long ago, people measured things using their own feet and hands.