How do you find proper factors?

Answer 1

Proper factors are all the factors of a number except the number itself. To find the factors of a number, start with 1 and list the factor pairs of the number. For example, the factor pairs of 18 are:

1 x 18

2 x 9

3 x 6

The factors of 18 are: 1, 2, 3, 6, 9, 18.

The proper factors are: 1, 2, 3, 6, 9.

Answer 2

Take the list of regular factors and remove one and the number itself.