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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.

A ruler has little marks in a row. We line it up next to a thing to see how long it is, using numbers like centimetres.

↔️ All Measuring Size facts →

More facts about Measuring Size

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. The tallest tree is so big you'd need a very long tape to measure it. The tallest tree is so big you'd need a very long tape to measure it.