Name: 
 

Lesson 7: Determining Common Factors



 1. 

Which of the following numbers is a factor of 54?
a.
7
b.
8
c.
9
d.
10
 

 2. 

Which of the following numbers is a factor of 63?
a.
2
b.
3
c.
4
d.
5
 

 3. 

Which of the following numbers is a factor of 45?
a.
2
b.
3
c.
4
d.
6
 

 4. 

Which of the following numbers is NOT a factor of 28?
a.
4
b.
7
c.
2
d.
8
 

 5. 

Which of the following numbers is NOT a factor of 63?
a.
3
b.
4
c.
7
d.
9
 

 6. 

What is the GCF of 24 and 12?
a.
4
b.
6
c.
8
d.
12
 

 7. 

What is the GCF of 24 and 36?
a.
8
b.
12
c.
6
d.
4
 

 8. 

What is the GCF of 45 and 18?
a.
5
b.
9
c.
15
d.
8
 

 9. 

Mr. Wong and Mr. Green share a garden fence.  Mr. Wong’s garden plot is 24 m2 and Mr. Green’s garden plot is 36 m2.  What is the greatest length of fence they can share?
a.
12 m
b.
18 m
c.
16 m
d.
8 m
 

 10. 

What is the GCF of two prime numbers?
a.
0
b.
1
c.
2
d.
3
 



 
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