# Recognise When to Use a Volume Formula

In this worksheet, students will try to recognise when it is possible to use formulae for the volume of the given shapes.

Key stage:  KS 2

Curriculum topic:   Measurement

Curriculum subtopic:   Use Area/Volume Formulae

Difficulty level:

#### Worksheet Overview

Use the following formulae to work out the volumes of these 3D solid shapes:

Cube

We need to know the side length.

Remember that the length, the width and the height will all be equal to the side length, because this is a cube.

Volume of cube = side length x side length x side length

Cuboid

We need to know the length, the width and the height.

Volume of cuboid = length x width x height

Example

Can a volume formula be used to work out the volume of this cuboid, and if so, which one is best?

This is a cuboid.

We need to know the length, the width and the height.

The length is 15 cm, the width is 4 cm and the height is 8 cm.

Yes, we can use the volume formula:

Volume of cuboid  = length × width × height

If we had to work it out, we would do 15 x 4 x 8 = 480 cm2

Example 2

Can a volume formula be used to work out the volume of this cube, and if so, which one is best?

This is a cube.

We need to know the side length.

The side length is 7 cm, so the width and the height are also 7 cm.

Yes, we can use the volume formula:

Volume of cube  = side length × side length × side length

If we had to work it out, we would do 7 x 7 x 7 = 343 cm2

Example 3

Can a volume formula be used to work out the volume of this cuboid, and if so, which one is best?

This is a cuboid.

We need to know the length, the width and the height.

The length is 9 cm, the width is 4 cm but we do not know the height.

No, we cannot use a volume formula.

NB: The length, the width and the height are all interchangeable with each other, depending on how you look at a cuboid.

Are you ready to have a go at some questions now?

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