124, yes.
125, no.
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No, 31 is not a factor of 148.
It is: 2
Unfortunately, some crucial information is missing from your question. Please re-submit it and write out what happens between the two and the three. 125 - 2/3 = 124 and 1/3 125 - 2 + 3 = 126 125 - 23 = 102
Try a factor tree. 124 62,2 31,2,2 2 x 2 x 31 = 124
The GCF is 2.