GCF/LCM Worksheet
1 a.  Find the GCF of these numbers:
36,  63
 
 
1 b.  Find the LCM of these numbers:
68,  21
 
 
2 a.  Find the GCF of these numbers:
84,  42
 
 
2 b.  Find the LCM of these numbers:
58,  62
 
 
3 a.  Find the GCF of these numbers:
91,  77
 
 
3 b.  Find the LCM of these numbers:
40,  69
 
 
4 a.  Find the LCM of these numbers:
50,  78
 
 
4 b.  Find the GCF of these numbers:
54,  60
 
 
5 a.  Find the LCM of these numbers:
28,  68
 
 
5 b.  Find the GCF of these numbers:
66,  55
 
 
6 a.  Find the GCF of these numbers:
30,  60
 
 
6 b.  Find the GCF of these numbers:
20,  80
 
 
7 a.  Find the LCM of these numbers:
92,  48
 
 
7 b.  Find the LCM of these numbers:
40,  6
 
 
8 a.  Find the LCM of these numbers:
88,  57
 
 
8 b.  Find the LCM of these numbers:
7,  49
 
 
9 a.  Find the GCF of these numbers:
6,  84
 
 
9 b.  Find the GCF of these numbers:
78,  52
 
 
10 a.  Find the LCM of these numbers:
27,  81
 
 
10 b.  Find the GCF of these numbers:
14,  28
 
 
Page 2

Answer Key

1 a.  9

 
1 b.  1428

 
2 a.  42

 
2 b.  1798

 
3 a.  7

 
3 b.  2760

 
4 a.  1950

 
4 b.  6

 
5 a.  476

 
5 b.  11

 
6 a.  30

 
6 b.  20

 
7 a.  1104

 
7 b.  120

 
8 a.  5016

 
8 b.  49

 
9 a.  6

 
9 b.  26

 
10 a.  81

 
10 b.  14

 


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