The Definitive Four Fours Answer Key
Library Home || Full Table of Contents || Suggest a Link || Library Help
|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|
© 1994-2014 Drexel University. All rights reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.