Q:

How many factors are there of the number 18?

A:

Quick Answer

There are six factors of the number 18. The factors are one, two, three, six, nine and 18. Each of these numbers can divide the number 18 without a remainder, making them factors of 18.

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Full Answer

Begin a list of factors of a number by first listing the number along with the number one. This is because any integer divided by itself will always result in the number one. Next, test whether the number is divisible by two without a remainder, by three without a remainder and so on. For example, 18 divided by two is nine, and 18 divided by three is six. Attempting to divide 18 by four or five results in a remainder.

Since prior calculations have already established that six is a factor of 18, there is no need to test for more factors.

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