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Figure This!
 

Keijzer, Ronald, Mieke Abels, Laura J. Brinker, S. R. Cole, and Julia A. Shew. Ratios and Rates. In Mathematics in Context. National Center for Research in Mathematical Sciences Education and Freudenthal Institute. Chicago: Encyclopaedia Britannica Educational Corporation, 1998.

Lappan, G., J. Fey, W. Fitzgerald, S. Friel, and R. Phillips. Connected Mathematics: Comparing and Scaling. Palo Alto, CA: Dale Seymour Publications, 1996.

Niven, Ivan. Numbers: Rational and Irrational. New Mathematical Library, Vol. 1. Washington, DC: Mathematical Association of America, 1961.

 

 
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