Pre-Algebra Finding the Greatest Common Factor Worksheet

1. Find the GCF of 75, 25.
5
10
15
25

2. Find the GCF of 4, 8.
32
2
4
8

3. Find the GCF of 14, 49.
7
14
49
2

4. Find the GCF of 22, 77.

11
22
77
99

5. Find the GCF of 45, 63.
5
45
9
63

6. Find the GCF of 36, 54.
2
3
18
54

7. Find the GCF of 34, 68.
34
68
17
4

8. Find the GCF of 16, 36.
4
36
2
8

9. Find the GCF of 20, 400.
10
400
2
20

10. Find the GCF of 38, 95.
38
95
19
35





Answer Key