Lesson 55: Prime and Composite Numbers, Activity Using Arrays to Find Factors — Practice Questions

1. 1. A composite number has more than two factors. Which of the following numbers is composite?

   • A. $13$
   • B. $17$
   • C. $23$
   • D. $25$

2. 2. Use the distributive property to simplify the expression $5(3x + 4)$. The simplified expression is ___.

3. 3. A prime number has exactly two factors. A composite number has more than two. The number 33 is composite. How many factors does 33 have?

4. 4. Which of the following is a prime number?

   • A. $15$
   • B. $21$
   • C. $29$
   • D. $39$

5. 5. Apply the distributive property to simplify the expression $7(2y - 3)$. The result is ___.

6. 6. Which of the following numbers is a prime number?

   • A. 15
   • B. 19
   • C. 21
   • D. 27

7. 7. The sixth multiple of 8 is ___.

8. 8. Which of the following statements about multiples is true?

   • A. 34 is a multiple of 8.
   • B. 65 is a multiple of 5.
   • C. 7 is a multiple of 14.
   • D. 50 is a multiple of 9.

9. 9. The only even prime number is ___.

10. 10. Why is the number 25 not a prime number?

    • A. It is an odd number.
    • B. Its only factors are 1 and 25.
    • C. It has more than two factors.
    • D. It is a multiple of 1.