3 x 7 = 21 3 x 3 x 5 = 45 The GCF is 3.
2 x 21 3 x 14 6 x 7 2 x 3 x 7
3 x 3 x 5 = 45 2 x 2 x 3 x 3 = 36
2 x 2 x 2 x 2 x 2 = 32 3 x 3 x 5 = 45
45 = 3 x 3 x 5 60 = 2 x 2 x 3 x 5
45 = 3 x 3 x 5 56 = 2 x 2 x 2 x 7
24 = 2 x 2 x 2 x 3 45 = 3 x 3 x 5 GCF = 3
45 x 2 30 x 3 18 x 5 15 x 6 10 x 9 2 x 3 x 3 x 5 2 x 3 x 15 2 x 5 x 9 3 x 3 x 10 3 x 5 x 16
The factors of 18 are: 1, 2, 3, 6, 9, 18 The factors of 36 are: 1, 2, 3, 4, 6, 9, 12, 18, 36 The factors of 45 are: 1, 3, 5, 9, 15, 45
1. (28 = 2 x 2 x 7, 45 = 3 x 3 x 5)
For 21, 3 and 7. For 12, 2 and 3.
The GCF of 36, 40, and 45 is 1. Add: 36 = 2 x 2 x 3 x 3 40 = 2 x 2 x 2 x 5 45 = 3 x 3 x 5 GCF = 1