Placement Test Practice 2.1 (Prime Factorization)

© 1992, 1999 Amby Duncan-Carr

Answer the questions below and then click the button at the bottom of the page to immediately check your answers.

  1. Which of the following is the prime factorization of 630?
  2. Your answer:
    10 x 63
    7 x 9 x 10
    2 x 3 x 3 x 5 x 7
    2 x 5 x 7 x 9
    None of these.


  3. Which of the following is the prime factorization of 42?
  4. Your answer:
    2 x 3 x 7
    3 x 4 x 7
    6 x 7
    2 x 21
    None of these.


  5. Which of the following is the prime factorization of 72?
  6. Your answer:
    2 x 2 x 3 x 3 x 3
    2 x 2 x 2 x 3 x 3
    3 x 4 x 6
    8 x 9
    None of these.


  7. Which of the following is the prime factorization of 105?
  8. Your answer:
    7 x 15
    2 x 3 x 5 x 7
    3 x 5 x 7
    5 x 21
    None of these.


  9. Which of the following is the prime factorization of 180?
  10. Your answer:
    10 x 18
    3 x 4 x 15
    4 x 5 x 9
    2 x 2 x 3 x 3 x 5
    None of these.



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