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

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

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

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

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



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