Identify Whether a Number is Prime or Composite

In this worksheet, students will decide whether a given number is prime or composite.

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

prime number is one that has exactly two factors, itself and 1.

composite number is one that has more than two factors.

Prime numbers include 2, 3, 5, 7, 11, 13, 17 etc.....

Composite numbers include 4, 6, 8, 9, 10, 12, 14, 15 etc....

The only even number that is prime is the number 2. All other even numbers will have the number 2 as a factor, so they can't be prime.

The number 1 is not a prime number because it has only one factor - 1!

In this activity, we will be deciding whether a number is prime or composite.

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