45
15,3
5,3,3
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The prime factorization is 11 x 5, so the factor tree is simple: 55 11 x 5
Since 45 is a factor of 270, it is automatically the GCF.
3 is a common factor of 57and 45.
1936 /\ 44 45 /\ /\ 22 15 /\ /\ 1 1 12
because 9 times 5 = 45