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

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

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

  4.   Write the prime factorization of 810.
    A. 2 ×3 × 5 B. 32 × 4 × 5
    C. 2 × 5 × 92 D. 2 × 34 × 5
    Hint

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



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