

1. 
Which of the following numbers is prime? 


A. 
15 
B. 
5 


C. 
9 
D. 
1 


Hint 


2. 
Write the prime factorization of 1500. 


A. 
2^{2} × 3 × 5^{2} 
B. 
2 × 3 × 5 


C. 
2^{2} × 3 × 5^{3} 
D. 
2^{2} × 3 × 5^{2} × 10^{2} 


Hint 


3. 
Which of the following numbers is prime? 


A. 
57 
B. 
63 


C. 
43 
D. 
75 


Hint 


4. 
What are the prime factors of 810? 


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


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


Hint 


5. 
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 


