They have a common factor of 3.
1, 2, 3, and 6 go into 6.
1, 3, 5, and 15 go into 15.
1 and 3 both go into 6 and 15.
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15: 15 one 6: 2, 3, 6 three
1, 2, 3, 5, 6, 10, 15, 30
The only number that can go into both numbers is 5
1,2,3, and 6
9 and 6