The GCF is 28.
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Since 40 is a factor of 280, it is automatically the GCF.
Greatest common factor of 42 and 280 is 14.
140 is the Greatest Common Factor of 280 and 980.
The GCF is 56.
The prime factor tree of 280 is:140,270,2,235,2,2,27,5,2,2,2