# Identify Prime Numbers

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

Key stage:  KS 2

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

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

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.

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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