The Definitive Four Fours Answer Key
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|David A. Wheeler|
|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)|
|Resource Types:||Problems/Puzzles, Articles, Recreations|
|Math Topics:||Basic Operations, Number Sense/About Numbers|
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