**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 6:** Is 7 a factor of 21? Why?

**Answer.** Since 21 can be written as , 7 is a factor. Also is an even division.

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Author: Nancy Marcus

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