Mathematics ACT Aspire Test 2025 – 400 Free Practice Questions to Pass the Exam

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What is the least common multiple (LCM) of 5 and 10?

The LCM is 10

To find the least common multiple (LCM) of two numbers, such as 5 and 10, we look for the smallest multiple that both numbers share.

First, let's list the multiples of each number:

- The multiples of 5 are: 5, 10, 15, 20, 25, and so forth.

- The multiples of 10 are: 10, 20, 30, 40, and so on.

Next, we identify the smallest number that appears in both lists. In this case, 10 is the first multiple that appears in both lists. Therefore, the least common multiple of 5 and 10 is 10.

This makes it clear why the choice indicating the LCM is 10 is correct, as it is indeed the smallest number that is a multiple of both original numbers. The other choices provided are either multiples of one of the numbers or larger than the necessary LCM, which does not satisfy the condition of being the least common multiple.

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The LCM is 15

The LCM is 5

The LCM is 20

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