

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 36 and 45? 


A. 
45 
B. 
3 


C. 
9 
D. 
36 


Hint 


3. 
What is the greatest common factor of 25a^{2}b and 5ab^{2}? 


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


C. 
5ab^{2} 
D. 
5 


Hint 


4. 
What is the greatest common factor of 39 and 18? 


A. 
3 
B. 
13 


C. 
9 
D. 
6 


Hint 


5. 
What is the greatest common factor of 20x^{2} and 32x^{3}? 


A. 
8x^{3} 
B. 
4x 


C. 
4x^{2} 
D. 
8x 


Hint 


