find all factors of 72
Apart from 1, all of the other factors of 72 are multiples of prime factors.
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.
Since 36 is a factor of 72, all of its factors are included in the factors of 72.
The prime factors of 72 are 2 and 3.
Since 12 is a factor of 72, all of its factors are common.
Common factors of 72 and 80 are: 1, 2, 4, and 8.
The factors of 72: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72.
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90
All of them except "1."
This is missing some crucial information, but let's pick a number. Assume the missing number is 36. Since 36 is a factor of 72, all the factors of 36 are factors of 72.