GCF/LCM Worksheet
1 a.  Find the LCM of these numbers:
54,  77
 
 
1 b.  Find the GCF of these numbers:
91,  71
 
 
2 a.  Find the LCM of these numbers:
52,  99
 
 
2 b.  Find the LCM of these numbers:
43,  56
 
 
3 a.  Find the LCM of these numbers:
31,  15
 
 
3 b.  Find the GCF of these numbers:
81,  99
 
 
4 a.  Find the LCM of these numbers:
10,  22
 
 
4 b.  Find the GCF of these numbers:
30,  45
 
 
5 a.  Find the GCF of these numbers:
64,  48
 
 
5 b.  Find the LCM of these numbers:
15,  44
 
 
6 a.  Find the GCF of these numbers:
77,  33
 
 
6 b.  Find the GCF of these numbers:
7,  21
 
 
7 a.  Find the GCF of these numbers:
84,  56
 
 
7 b.  Find the GCF of these numbers:
33,  55
 
 
8 a.  Find the LCM of these numbers:
59,  8
 
 
8 b.  Find the GCF of these numbers:
90,  100
 
 
9 a.  Find the GCF of these numbers:
56,  75
 
 
9 b.  Find the GCF of these numbers:
30,  15
 
 
10 a.  Find the GCF of these numbers:
99,  55
 
 
10 b.  Find the LCM of these numbers:
90,  14
 
 
Page 2

Answer Key

1 a.  4158

 
1 b.  1

 
2 a.  5148

 
2 b.  2408

 
3 a.  465

 
3 b.  9

 
4 a.  110

 
4 b.  15

 
5 a.  16

 
5 b.  660

 
6 a.  11

 
6 b.  7

 
7 a.  28

 
7 b.  11

 
8 a.  472

 
8 b.  10

 
9 a.  1

 
9 b.  15

 
10 a.  11

 
10 b.  630

 

Copying permission: You are free to copy this worksheet to any number of students for their mathematics work. Do not distribute on websites, books, or any such material without permission. Copyright www.HomeschoolMath.net