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

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

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

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

  5.   Factor 18ab2.
    A. 2 · 3 · 3 · a · b · b B. 2 · 3 · a · b · b
    C. 2 · 3 · 3 · a · b D. 22 · 3 · a · b · b
    Hint



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