Cube numbers practice for 11+ maths
21 October 2026
Understanding cube numbers
Cube numbers are made by multiplying a whole number by itself, and then by itself again. In maths, this is called cubing a number.
Cube numbers are important for the 11+ exam because they are used in questions about powers and 3D shapes.
How to cube a number
To cube a number, multiply it by itself three times.
This is written as the number with a small 3 above it, for example 4³.
Worked example
Step 1: Start with the number 4
Step 2: Multiply 4 by itself. 4 × 4 = 16
Step 3: Multiply the result by 4 again. 16 × 4 = 64
The correct answer is 64. So, the cube number of 4 is 64.
Helping your child practise
Encourage your child to find cube numbers for different whole numbers. Use building blocks or draw cubes to help them see how the numbers grow.
Regular practice will help your child feel more confident with this topic.
Key insight: Cube numbers are a core part of 11+ maths. Practising them helps children understand powers and visualise 3D shapes.
