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

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

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

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

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



Glencoe
The McGraw-Hill Companies