Determine the prime factorization of the number.
-20
A) 2 ·2 ·5
B) 5 ·5
C) 4 ·5
D) 10 ·2

Question

Quizplus · Accepted Answer

The prime factorization of 20 is 2 × 2 × 5. Therefore, the correct choice is A, which lists these prime factors in order. Start by dividing 20 by its smallest prime factor, which is 2. This gives 10. Then, divide 10 by its smallest prime factor, which is also 2. This gives 5. Since 5 is a prime number, we cannot factor it any further. Therefore, the prime factorization of 20 is 2·2·5, which is choice A.

Determine the Prime Factorization of the Number