1. 6 : 1, __, 3, 6
12 : 1, 2, 3, 4, __, 12
Common Factors :___________________
GCF :______
2. 9 : 1, __, 9
12 : 1, 2, 3, 4, __, 12
Common Factors :___________________
GCF :______
3. 10 : 1, 2, 5, __
15 : 1, 3, __, 15
Common Factors :___________________
GCF :______
4. 20 : 1, 2, 4, 5, __, 20
40 : 1, 2, 4, 5, 8, 10, __, 40
Common Factors :___________________
GCF :______
5. 21 : 1, 3, 7, __
35 : 1, 2, 5, __, 15, 30
Common Factors :___________________
GCF :______