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

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

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

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

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



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