Next week the children will be looking at measures. They will be estimating volume (e.g. using 1 cm3 blocks to build cubes, including cuboids) & capacity (e.g. using water). The children will also convert between different units of metric measure (e.g. km/m; cm/m; cm/mm; g/kg; l/ml).

The volume of a shape is a measure of all of its 3d space. Simple formulas can help you find a shape’s volume.

# Counting cubes

The volume of a shape measures the 3-dimensional amount of space that it takes up. Volume is measured in **cubes**.

A cubic cm has sides of length 1cm. It has a volume of 1cm^{3} (1 cm cubed).

This cuboid contains 12 cubes. Each cube has a volume of 1cm^{3}. So the volume of this cuboid is 12cm^{3}.

# Cuboids

To find the volume of a cuboid multiply its **length by its width by its height**. We can write this as:

**volume = l × w × h**

## Example

The volume of this cereal packet is:

8 × 20 × 30 = 4800cm^{3}