

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


A. 
2 × 3 × 5 
B. 
2 × 60 


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


Hint 


2. 
What are the prime factors of 120? 


A. 
2, 3, 5 
B. 
2, 60 


C. 
2, 2, 2, 3, 5 
D. 
2, 2, 30 


Hint 


3. 
Which of the following numbers is prime? 


A. 
15 
B. 
9 


C. 
5 
D. 
1 


Hint 


4. 
Which of the following numbers is composite? 


A. 
1 
B. 
31 


C. 
23 
D. 
9 


Hint 


5. 
Factor 20ef. 


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


C. 
4 · 5 · e · f 
D. 
2^{2} · e · f 


Hint 


