1.   Which of the following numbers is prime?
    A. 15 B. 1
    C. 9 D. 5
    Hint

  2.   Which of the following numbers is composite?
    A. 31 B. 9
    C. 1 D. 23
    Hint

  3.   Write the prime factorization of 204.
    A. 2 × 2 × 3 × 17 B. 6 × 17
    C. 2 × 17 D. 2 × 3 × 17
    Hint

  4.   What are the prime factors of 400?
    A. 2, 4, 5 B. 2, 5
    C. 4, 10, 10 D. 2, 200
    Hint

  5.   Which of the following numbers is prime?
    A. 75 B. 63
    C. 43 D. 57
    Hint



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