

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


A. 
20 
B. 
2 


C. 
4 
D. 
8 


Hint 


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


A. 
12x 
B. 
4x^{2} 


C. 
16x^{2} 
D. 
4x 


Hint 


3. 
What is the greatest common factor of 64 and 40? 


A. 
20 
B. 
2 


C. 
4 
D. 
8 


Hint 


4. 
What is the greatest common factor of 20x^{2} and 32x^{3}? 


A. 
4x^{2} 
B. 
8x 


C. 
8x^{3} 
D. 
4x 


Hint 


5. 
Janice has three pieces of string that are 36 cm, 24 cm, and 18 cm in length. She needs to have strings that are all the same length, but she does not want to waste any string. What is the greatest length Janice can cut each piece of string into and still have equal lengths? 


A. 
3 cm 
B. 
6 cm 


C. 
9 cm 
D. 
12 cm 


Hint 


