**Rule 9:To factor an integer, simply break the integer down into a group
of numbers whose product equals the original number. Factors are separated by multiplication signs. Note that the number 1 is the factor of every number. All factors of a number can be divided evenly into that number.**

**Problem 5:** Is 3 a factor of 10? Why?

**Answer.** The factors of 10 are . 3 is not a factor. Another way to check to see whether 3 is a factor of 10 is to divide 10 by 3. If the answer is even (no decimal), it is a factor. If the answer is a decimal, 3 is not a factor of 10. Since , 3 is not a factor of 10.

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Author: Nancy Marcus

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