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

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

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

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

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



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