Factoring Integers: Problem 6

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 tex2html_wrap_inline17 , 7 is a factor. Also tex2html_wrap_inline19 is an even division.

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