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Identify Prime Numbers

In this worksheet, students will state whether or not a number is prime.

'Identify Prime Numbers' worksheet

Key stage:  KS 2

Year:  Year 5 Maths worksheets

Curriculum topic:   Number: Multiplication and Division

Curriculum subtopic:   Know Prime Numbers

Difficulty level:  

Worksheet Overview

 In this activity, we are going to be looking at the factors of numbers.

 

The number 6 has four factors, shown in pairs on the legs of this factor spider.

The factor pairs of 6 are:

1 and 6

2 and 3

So, it has two factor pairs and four factors: 1, 2, 3 and 6

 

Factor spider 6

 

The number 12 has six factors, shown on the legs of this factor spider.

 

Factor spider 12

 


The factor pairs of 12 are:
1 and 12
2 and 6
3 and 4

 

So there are three factor pairs and six factors: 1, 2, 3, 4, 6 and 12

 

Some factor spiders, such as the number 7, only have two legs.

These are the prime number factor spiders.

 

Factor spider 7

 

Prime numbers are very special.

They have only two factors: 1 and the number itself.

 

Let's have a go at some questions now.

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