Find the factors and identify the GCF.
1. 15 and 45
15:______
45:______
GCF:______
2. 28 and 36
28:______
36:______
GCF:_____
3. 8 and 12
8:_____
12:_____
GCF:_____
4. 8, 24 AND 40
8:______
24______
GCF:______
5. 16,24, and 32
16:______
24:______
32:______
GCF:______
6. 8,12 and 16
8:______
12:_____
16:______
GCF:_____
7. 18 and 24
18:_____
24:_____
GCF:_____
8. 36 and 33
36:______
33:______
GCF:_____
9. 45 and 81
45:_______
81:_______
GCF:______
10. 6,15,48 and 51
6:______
15:_____
48:____
51:______
GCF:_____
1. 15 and 45
15:______
45:______
GCF:______
2. 28 and 36
28:______
36:______
GCF:_____
3. 8 and 12
8:_____
12:_____
GCF:_____
4. 8, 24 AND 40
8:______
24______
GCF:______
5. 16,24, and 32
16:______
24:______
32:______
GCF:______
6. 8,12 and 16
8:______
12:_____
16:______
GCF:_____
7. 18 and 24
18:_____
24:_____
GCF:_____
8. 36 and 33
36:______
33:______
GCF:_____
9. 45 and 81
45:_______
81:_______
GCF:______
10. 6,15,48 and 51
6:______
15:_____
48:____
51:______
GCF:_____
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Answer:
1.
15: 15×1
45: 15×3
GCF: 15
2.
28: 4×7
36: 4×9
GCF:. 4
3.
8: 4×2
12: 4×3
GCF: 4
4.
8: 8×1
24: 8×3
40: 8×5
GCF: 8
5.
16: 8×2
24: 8×3
32: 8×4
GCF: 8
6.
8: 4×2
12: 4×3
16: 4×4
GCF: 4
7.
18: 6×3
24: 6×4
GCF: 6
8.
36: 3×12
33: 3×11
GCF: 3
9.
45: 9×5
81: 9×9
GCF: 9
10.
6: 3×2
15: 3×5
48: 3×16
51: 3×17
GCF: 3
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