The GCF is 1.
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35: 1, 5, 7, 3572: 1, 2, 3, 4, 6, 9, 12, 18, 24, 36, 72The only factor 35 and 72 have in common is 1.GCF = 1
35 and 70 have a GCF of 35.
The GCF of 35, 45 and 54 is just 1. There are no common factors between these 3 numbers aside from 1.
You need at least two numbers to find a GCF.
The GCF is 1.