Factors of 18 in pairs

Factors are pairs of numbers which, if multiplied together, give the original number.

The number 18 is a composite number. So, 18 has more than one factor pair.

These are all the factor pairs of 18:

• 1,18
• 2,9
• 3,6

Here is how to find the factor pairs for the number 18:

• 18 divided by 1 is 18. So, (1, 18) is a factor pair of 18
• 18 divided by 2 is 9. So, (2, 9) is a factor pair of 18
• 18 divided by 3 is 6. So, (3, 6) is a factor pair of 18

Factor pairs of 18 that ads up to a number:

• The factors of 18 that adds up to 19 are 1 and 18
• The factors of 18 that adds up to 20 are 2 and 9
• The factors of 18 that adds up to 21 are 3 and 6

Note 1: if we change the order of all pairs above, we can double the number of pairs. We choose not to show them.
Note 2: do not confuse these pairs with prime factors. See below some info:

The factorization or decomposition of 18 is 2•3².

The prime factors of 18 are 2 and 3. It is the list of the integer's prime factors.