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

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

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

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

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



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