Numbers can be classified using different properties. Recognising these properties helps you understand how numbers behave and how they are used in calculations.

Odd and even numbers
Even numbers are divisible by 2 with no remainder (for example, 8, 14, 100).
Odd numbers are not divisible by 2 (for example, 7, 13, 101).

Integers
Integers are whole numbers and their negatives, including zero.
Examples: −4, −1, 0, 3, 12

Multiples
Multiples are the results of multiplying a number by whole numbers.
For example, multiples of 5 are 5, 10, 15, 20, and so on.

Factors
Factors are numbers that divide exactly into another number.
For example, the factors of 12 are 1, 2, 3, 4, 6, and 12.

Prime numbers
A prime number has exactly two factors: 1 and itself.
Examples include 2, 3, 5, 7, and 11.
The number 1 is not prime.

You should be able to identify and use these properties to describe numbers, solve problems, and choose suitable methods in calculations.

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