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The factors of 280 are:
1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280
The factors of 420 are:
1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 60, 70, 84, 105, 140, 210, 420
The common factors are:
1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140
The Greatest Common Factor:
GCF = 140
Wiki User
∙ 8y agoThis answer is:
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Wiki User
∙ 12y agoGCF(280, 420) = 140
140*2 = 280
140*3 = 420
and, since 2 and 3 are co-prime, there cannot be a greater common factor.
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