

1. 
Which of the following numbers is composite? 


A. 
31 
B. 
9 


C. 
23 
D. 
1 


Hint 


2. 
Write the prime factorization of 204. 


A. 
6 × 17 
B. 
2 × 2 × 3 × 17 


C. 
2 × 3 × 17 
D. 
2 × 17 


Hint 


3. 
Write the prime factorization of 1500. 


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


C. 
2^{2} × 3 × 5^{2} 
D. 
2 × 3 × 5 


Hint 


4. 
What are the prime factors of 400? 


A. 
4, 10, 10 
B. 
2, 200 


C. 
2, 5 
D. 
2, 4, 5 


Hint 


5. 
Which of the following numbers is prime? 


A. 
43 
B. 
75 


C. 
57 
D. 
63 


Hint 


