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Factors of 28... 1,2,4,7,14,28 Factors of 44... 1,2,4,11,22,44 Common factors therefore are 1,2 & 4
Common factors of 44 and 60 are: 1, 2, and 4.
The common factors of 44 and 55 are: 1 and 11
Common factors of 22 and 44 are: 1, 2, 11, and 22.
The GCF of 21, 33, and 44 is 1. Note that the factors of 21 are 1,3,7 and 21 itself. Of these none is a factor of 33 and 44 except 1. You can look at the prime factorization of the numbers. Note there is no prime in common with all three numbers in the set, so the GCF is 1. 3x7=21 11x3=33 11x22 =44