ISEE Word Problems Question 166: Answer and Explanation

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Question: 166

2. If a and b are prime numbers, what is the least common multiple of 12a, 15ab, and 6a²?

A. 60a²b
B. 60ab
C. 12a²b
D. 12ab

Correct Answer: A

Explanation:

The answer is A

Begin with the numbers. The least common multiple of the numerical terms is 60. Move on to a. The least common multiple of a and a² is a². Now address b. As there is only one b, the least common multiple is b. Thus, the least common multiple is 60a²b.

If it is not clear that the least common multiple of a and a² is a², you may plug in for a. If a = 3, the least common multiple of 3 and 9 is 9.

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