Year 7 Interactive Maths - Second Edition

Factors

A whole number that divides exactly into another whole number is called a factor of that number.

So, 4 is a factor of 20 as it divides exactly into 20.

So, 5 is a factor of 20 as it divides exactly into 20.

Note:

If a number can be expressed as a product of two whole numbers, then the whole numbers are called factors of that number.

So, the factors of 20 are 1, 2, 4, 5, 10 and 20.

Example 5

List all the factors of 42.

Solution:

So, the factors of 42 are 1, 2, 3, 6, 7, 14, 21 and 42.

Note:

Example 6

Is 7 a factor 15?

Solution:

Key Terms

factor, factors