GCF/LCM Worksheet
1 a.  Find the LCM of these numbers:
25,  52
 
 
1 b.  Find the LCM of these numbers:
68,  28
 
 
2 a.  Find the LCM of these numbers:
12,  36
 
 
2 b.  Find the GCF of these numbers:
30,  90
 
 
3 a.  Find the GCF of these numbers:
72,  54
 
 
3 b.  Find the LCM of these numbers:
19,  97
 
 
4 a.  Find the LCM of these numbers:
79,  36
 
 
4 b.  Find the LCM of these numbers:
15,  60
 
 
5 a.  Find the LCM of these numbers:
19,  15
 
 
5 b.  Find the GCF of these numbers:
30,  90
 
 
6 a.  Find the GCF of these numbers:
11,  77
 
 
6 b.  Find the GCF of these numbers:
45,  27
 
 
7 a.  Find the GCF of these numbers:
24,  64
 
 
7 b.  Find the GCF of these numbers:
90,  100
 
 
8 a.  Find the GCF of these numbers:
9,  45
 
 
8 b.  Find the GCF of these numbers:
45,  70
 
 
9 a.  Find the GCF of these numbers:
18,  99
 
 
9 b.  Find the LCM of these numbers:
82,  52
 
 
10 a.  Find the GCF of these numbers:
55,  88
 
 
10 b.  Find the LCM of these numbers:
62,  96
 
 
Page 2

Answer Key

1 a.  1300

 
1 b.  476

 
2 a.  36

 
2 b.  30

 
3 a.  18

 
3 b.  1843

 
4 a.  2844

 
4 b.  60

 
5 a.  285

 
5 b.  30

 
6 a.  11

 
6 b.  9

 
7 a.  8

 
7 b.  10

 
8 a.  9

 
8 b.  5

 
9 a.  9

 
9 b.  2132

 
10 a.  11

 
10 b.  2976

 


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