** 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 7:** Is 4 a factor of 87? Why?

**Answer.** No. When 87 is divided by 4, the answer is a decimal. Indeed, we have In Addition 87 can be written as and 4 is not part of the mix.

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Author: Nancy Marcus

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