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Prime Factorisations

In this worksheet, students select the correct prime factorisation for the given numbers.

'Prime Factorisations' worksheet

Key stage:  KS 2

Year:  Year 5 11+ worksheets

Curriculum topic:   Maths and Numerical Reasoning

Curriculum subtopic:   Factors and Multiples

Difficulty level:  

Worksheet Overview

The list of prime numbers starts as follows:

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37........


All other whole numbers are known as composite and can be written as the product of prime factors.


This is known as  prime factorisation.




35 = 5 x 7

14 = 2 x 7

28 = 2 x 2 x 7

24 = 2 x 2 x 2 x 3


Writing 24 = 2 x 3 x 4 is correct but it is not a full prime factorisation because the 4 is not prime.

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