

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


A. 
20 
B. 
8 


C. 
2 
D. 
4 


Hint 


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


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


C. 
5 
D. 
5ab 


Hint 


3. 
What is the greatest common factor of 16x^{2} and 12x? 


A. 
4x 
B. 
4x^{2} 


C. 
12x 
D. 
16x^{2} 


Hint 


4. 
George wants to resurface the table below with ceramic tiles. What is the largest square tile that he can use without having to cut any tiles? 





A. 
6 inches on each side 
B. 
4 inches on each side 


C. 
8 inches on each side 
D. 
12 inches on each side 


Hint 


5. 
What is the greatest common factor of 39 and 18? 


A. 
6 
B. 
3 


C. 
13 
D. 
9 


Hint 


