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The prime factor tree of 280 is:140,270,2,235,2,2,27,5,2,2,2
Since 40 is a factor of 280, it is automatically the GCF.
The factor pairs of 91 are (1,91) and (7,13).
280 140,2 70,2,2 35,2,2,2 7,5,2,2,2
Greatest common factor of 42 and 280 is 14.