The common factors of 36 and 81 are: 1, 3, and 9
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The greatest common factor between 36 and 81 is 9. 36/9 = 4 and 81/9 = 9.36/81 = 4/9.
The GCF is 9 36/81 = 4/9
Factors of 81 are [3 3 3 3] Factors of 75 are [3 5 5] Common factors [3] ■
Since 12 is a factor of 36, all of the factors of 12 are common to 36.
The common factors of 4 and 36 are 1, 2, and 4