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

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

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

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

  5.   Factor 20ef.
    A. 22 · e · f B. 4 · 5 · e · f
    C. 2 · 2 · 5 · e · f D. 2 · 10 · e · f
    Hint



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