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

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

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

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

  5.   Factor 8x2.
    A. 2 · 2 · 2 · x · x B. 2 · 2 · 2 · x
    C. 2 · 4 · x · x D. 8 · x
    Hint



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