The common factors of 36 and 38 are 1 and 2.
first find all factors of 38 and 36:
The factors of 36 are 1, 2, 3, 4, 6, 9, 12, and 36
The factors of 38 are 1, 2, 19, and 38
now see what they have in common
1 and 2
so the common factors of 38 and 36 are 1 and 2.
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36 as a product of its prime factors is 2 x 2 x 3 x 3. Their total is 10. 36 as a product of factors that total 13 is 4 x 9
The common factors of 21 and 36 are 1 and 3
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.
9 and 4 12 and 1
Since 36 is a factor of 72, all of its factors are included in the factors of 72.