

1. 
What are the prime factors of 120? 


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


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


Hint 


2. 
What are the prime factors of 400? 


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


C. 
2, 5 
D. 
2, 200 


Hint 


3. 
Which of the following numbers is prime? 


A. 
63 
B. 
43 


C. 
75 
D. 
57 


Hint 


4. 
Write the prime factorization of 810. 


A. 
2 × 5 × 9^{2} 
B. 
2 × 3^{4} × 5 


C. 
3^{2} × 4 × 5 
D. 
2 ×3 × 5 


Hint 


5. 
Factor 18ab^{2}. 


A. 
2 · 3 · 3 · a · b · b 
B. 
2 · 3 · 3 · a · b 


C. 
2 · 3 · a · b · b 
D. 
2^{2} · 3 · a · b · b 


Hint 


