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Casting Out Nines

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Visit this site: http://www.jimloy.com/number/nines.htm

Author:
Description: This essay explains the technique of casting out nines, a method of checking one's answers in arithmetic problems by eliminating groups of numbers that add to nine.

Levels: Late Elem. (3-5), Middle School (6-8)
Languages: English
Math Topics: Basic Operations

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