

1. 
Based on the factor trees, what is the greatest common factor of 8 and 20? 


A. 
20 
B. 
8 


C. 
4 
D. 
2 


Hint 


2. 
What is the greatest common factor of 25a^{2}b and 5ab^{2}? 


A. 
5ab 
B. 
5ab^{2} 


C. 
5a^{2}b^{2} 
D. 
5 


Hint 


3. 
What is the greatest common factor of 39 and 18? 


A. 
3 
B. 
6 


C. 
13 
D. 
9 


Hint 


4. 
What is the greatest common factor of 36, 54, and 90. 


A. 
36 
B. 
9 


C. 
6 
D. 
18 


Hint 


5. 
What is the greatest common factor of 14p^{2}q and 42p^{3}q^{2}? 


A. 
14pq 
B. 
7p^{2}q^{2} 


C. 
7pq 
D. 
14p^{2}q 


Hint 


