Factors of 72 that add up to 21

We take "Factors of 72 that add up to 21" to mean "What combination(s) of two factors of 72 when added together will equal 21?"

We find the solution by first listing all the factors of 72 and then we find all the different combinations of two factors of 72 that when added together equal 21.

The factors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 72.

After trying all the different ways of adding the factors above together, we found the following combination(s) of two factors of 72 that add up to 21 to be as follows:

3 + 18 = 21
9 + 12 = 21
12 + 9 = 21
18 + 3 = 21

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