

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


A. 
2 × 60 
B. 
2 × 3 × 5 


C. 
2 × 2 × 2 × 3 × 5 
D. 
2 × 2 × 3 × 5 


Hint 


2. 
Which of the following numbers is prime? 


A. 
5 
B. 
1 


C. 
9 
D. 
15 


Hint 


3. 
Write the prime factorization of 1500. 


A. 
2^{2} × 3 × 5^{2} 
B. 
2^{2} × 3 × 5^{2} × 10^{2} 


C. 
2 × 3 × 5 
D. 
2^{2} × 3 × 5^{3} 


Hint 


4. 
What are the prime factors of 810? 


A. 
3, 4, 5 
B. 
2, 3, 5 


C. 
3, 5 
D. 
2, 5, 9 


Hint 


5. 
Factor 20ef. 


A. 
2 · 2 · 5 · e · f 
B. 
2 · 10 · e · f 


C. 
2^{2} · e · f 
D. 
4 · 5 · e · f 


Hint 


