GCF/LCM Worksheet
1 a.  Find the GCF of these numbers:
45,  36
 
 
1 b.  Find the LCM of these numbers:
43,  44
 
 
2 a.  Find the GCF of these numbers:
77,  11
 
 
2 b.  Find the LCM of these numbers:
85,  69
 
 
3 a.  Find the GCF of these numbers:
30,  5
 
 
3 b.  Find the LCM of these numbers:
79,  93
 
 
4 a.  Find the GCF of these numbers:
78,  39
 
 
4 b.  Find the GCF of these numbers:
39,  59
 
 
5 a.  Find the LCM of these numbers:
8,  78
 
 
5 b.  Find the GCF of these numbers:
20,  60
 
 
6 a.  Find the GCF of these numbers:
22,  88
 
 
6 b.  Find the LCM of these numbers:
97,  42
 
 
7 a.  Find the LCM of these numbers:
8,  73
 
 
7 b.  Find the LCM of these numbers:
38,  99
 
 
8 a.  Find the LCM of these numbers:
48,  57
 
 
8 b.  Find the LCM of these numbers:
68,  40
 
 
9 a.  Find the GCF of these numbers:
75,  45
 
 
9 b.  Find the GCF of these numbers:
32,  64
 
 
10 a.  Find the GCF of these numbers:
3,  36
 
 
10 b.  Find the GCF of these numbers:
56,  42
 
 
Page 2

Answer Key

1 a.  9

 
1 b.  1892

 
2 a.  11

 
2 b.  5865

 
3 a.  5

 
3 b.  7347

 
4 a.  39

 
4 b.  1

 
5 a.  312

 
5 b.  20

 
6 a.  22

 
6 b.  4074

 
7 a.  584

 
7 b.  3762

 
8 a.  912

 
8 b.  680

 
9 a.  15

 
9 b.  32

 
10 a.  3

 
10 b.  14

 

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