An infinite number, starting with these: 42, 84, 126, 168, 210, 252, 294, +42 . . .
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Divide each number by their GCF, which is 18. 108/126 = 6/7
The following: 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84.
List the integers that will divide into 42 evenly with no remainder.
The number one.
Divide 7 into 291. If it comes out evenly, it's a factor. It doesn't, so it's not.