1.   Use the factor tree to write the prime factorization of 120.
    A. 2 × 2 × 3 × 5 B. 2 × 60
    C. 2 × 2 × 2 × 3 × 5 D. 2 × 3 × 5
    Hint

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

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

  4.   What are the prime factors of 810?
    A. 3, 5 B. 2, 5, 9
    C. 2, 3, 5 D. 3, 4, 5
    Hint

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



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