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 Everyday Examples
 Common Factor:  A number (or an algebraic expression) that is a factor of two or more numbers (or algebraic expressions).
Common factors can be used to group objects. If you would like to make an integral number of candy packages, and have 63 peppermints and 36 chocolates, then the common factor of 9 could be useful to create the sets. You could have 9 sets of 7 peppermints and 9 sets of 4 chocolates, so when combined, each set will contain 9 peppermines and 4 chocolates.