# 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.

### Which of the following is the prime factorization of 630?

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.

### Which of the following is the prime factorization of 42?

Your answer:
2 x 3 x 7
3 x 4 x 7
6 x 7
2 x 21
None of these.

### Which of the following is the prime factorization of 72?

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.

### Which of the following is the prime factorization of 105?

Your answer:
7 x 15
2 x 3 x 5 x 7
3 x 5 x 7
5 x 21
None of these.

### Which of the following is the prime factorization of 180?

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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