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The Definitive Four Fours Answer Key

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Visit this site: http://www.dwheeler.com/fourfours/

Author:David A. Wheeler
Description: From 0 up to 40,000, whole number mathematical expressions that use only common mathematical symbols and exactly four 4s. Wheeler offers his solutions in three different formats: an abbreviated list of answers; a text file of results, mathematical expressions, and their "impurity levels," to accommodate for variations in the operations allowed; and a downloadable PDF of all the above, plus discussion. See also Wheeler's article "When Adding and Multiplying are the Same" and discussion of weird bases, "Way Off Base."

Levels: Late Elem. (3-5), Middle School (6-8), High School (9-12)
Languages: English
Resource Types: Problems/Puzzles, Articles, Recreations
Math Topics: Basic Operations, Number Sense/About Numbers

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