Factors of 81 in pairs

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

The number 81 is a composite number. So, 81 has more than one factor pair.

These are all the factor pairs of 81:

• 1,81
• 3,27
• 9,9

Here is how to find the factor pairs for the number 81:

• 81 divided by 1 is 81. So, (1, 81) is a factor pair of 81
• 81 divided by 3 is 27. So, (3, 27) is a factor pair of 81
• 81 divided by 9 is 9. So, (9, 9) is a factor pair of 81

Factor pairs of 81 that ads up to a number:

• The factors of 81 that adds up to 82 are 1 and 81
• The factors of 81 that adds up to 84 are 3 and 27
• The factors of 81 that adds up to 90 are 9 and 9

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 81 is 3⁴.

The prime factors of 81 are 3. It is the list of the integer's prime factors.