If you are factoring 72:
72=
36x2=
6x6x2=
2x3x2x3x2
so, it would be 2x2x2x3x3
if you are looking for factors of 72:
1,2,3,4,6,8,9,12,18,24,36,72
The positive whole-number factors of 72 are:
1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 72.
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4, 6, 8, 9, 12, 18, 24, 36, 72
288 is one, 72 is the lowest one.
Factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18, and 36. The factors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 72. All of the factors of 36 are also factors of 72.
Try it out! Divide 72 by 48, for example on a calculator. If you get a whole number, it is; otherwise it's not.
Since 36 is a factor of 72, all of its factors are included in the factors of 72.