**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 1:** Factor 15 completely.

**Answer.** We have

Normally the 1 is left out. It is understood that 1 is the factor of every number.

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Author: Nancy Marcus

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