1.   What are the prime factors of 120?
    A. 2, 3, 5 B. 2, 2, 2, 3, 5
    C. 2, 2, 30 D. 2, 60
    Hint

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

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

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

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



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