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Two numbers whose sum is 0 are additive inverses of one another. See Table 3 in this Glossary. Example: a list of heights and weights for each player on a football team. A method of visually displaying a distribution of data values by using the median, quartiles, and extremes of the data set. A set of predefined steps applicable to a class of problems that gives the correct result in every case when the steps are carried out correctly.

Purposeful manipulations that may be chosen for specific problems, may not have a fixed order, and may be aimed at converting one problem into another. A strategy for finding the number of objects in a group without having to count every member of the group. For example, if a stack of books is known to have 8 books and 3 more books are added to the top, it is not necessary to count the stack all over again.