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

  2.   Write the prime factorization of 1500.
    A. 22 × 3 × 52 B. 22 × 3 × 53
    C. 22 × 3 × 52 × 102 D. 2 × 3 × 5
    Hint

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

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

  5.   Factor 20ef.
    A. 4 · 5 · e · f B. 2 · 2 · 5 · e · f
    C. 22 · e · f D. 2 · 10 · e · f
    Hint



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