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!
💡 Đo kích thước — Fun Facts
Fun “Did you know?” facts about Đo kích thước — tap through 10 at a time!
The tallest tree is so big you'd need a very long tape to measure it.
A giant redwood tree can grow taller than 100 metres. That's higher than a tall building — far too big for one ruler to measure!
Long ago, people measured things using their own feet and hands.
Before rulers, people counted how many feet long a room was by walking heel to toe. That's why we still have a length called a 'foot'!
We use a scale to measure how heavy something is.
Size isn't only about how long something is — it can be about weight too. We stand on a scale, and it shows our weight in numbers called kilograms.
One metre is about as long as a big step or a baseball bat.
A metre is a handy size for measuring. It's about how far you reach from your nose to your fingertips with your arm out to the side.
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.
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.