# Select the Correct Prime Factorisations of Given Numbers

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

Key stage:  KS 3

Curriculum topic:   Number

Curriculum subtopic:   Use Concepts and Vocabulary for All Numbers

Popular topics:   Prime Numbers worksheets, Factors worksheets

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.

Examples

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.

In this activity, we are going to investigate writing numbers as a product of their prime factors.

How do you feel about that?

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