The common factors are: 1, 3
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Only the number 1.
To find the greatest common factor (GCF) of 57, 39, and 15, we need to first find the factors of each number. The factors of 57 are 1, 3, 19, and 57. The factors of 39 are 1, 3, 13, and 39. The factors of 15 are 1, 3, 5, and 15. The common factor among all three numbers is 3, making it the greatest common factor.
The GCF is 3.
1, 13.
Factor them. 3 x 5 = 15 39 3 x 3 x 5 = 45 Combine the factors, eliminating duplicates. 3 x 3 x 5 x 39 = 1755, the LCM.