

1. 
Use the factor tree to write the prime factorization of 120. 


A. 
2 × 2 × 3 × 5 
B. 
2 × 3 × 5 


C. 
2 × 60 
D. 
2 × 2 × 2 × 3 × 5 


Hint 


2. 
What are the prime factors of 120? 


A. 
2, 2, 30 
B. 
2, 2, 2, 3, 5 


C. 
2, 60 
D. 
2, 3, 5 


Hint 


3. 
Which of the following numbers is prime? 


A. 
9 
B. 
5 


C. 
15 
D. 
1 


Hint 


4. 
What are the prime factors of 400? 


A. 
2, 4, 5 
B. 
4, 10, 10 


C. 
2, 5 
D. 
2, 200 


Hint 


5. 
Write the prime factorization of 810. 


A. 
3^{2} × 4 × 5 
B. 
2 × 3^{4} × 5 


C. 
2 × 5 × 9^{2} 
D. 
2 ×3 × 5 


Hint 


