What are derived units?

Derived units are units you make by combining other units, just like mixing colors to make a new color.

Imagine you have a toy box full of blocks. Each block is a simple unit, like one red block could be a meter, and one blue block could be a second. Now, if you stack 10 red blocks together, that’s a decimeter, which is a bigger version of the meter. That's a derived unit! It came from combining other units.

Sometimes you multiply or divide units to make something new. For example:

• To find out how fast your toy car moves, you might use distance divided by time, that gives you speed, and the unit would be meters per second.
• If you want to know how much space a box takes up, you multiply length × width × height, that’s volume, with units like cubic meters.

Derived units help us describe more complicated things in simple ways. Just like how building blocks can make towers or cars, combining units lets us talk about everything from the speed of a race car to the size of your bedroom!