Three Balloons for Two Dollars: Developing Proportional Reasoning

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  • 1 Illinois State University (ISU), Normal, IL 61790-4520.
  • 2 ISU to the National Research Council, Washington, DC 20016

Ellen, Jim, and Steve bought three helium-filled balloons and paid $2 for all three. They decided to go back to the store and buy enough balloons for everyone in the class.


CYNTHIA LANGRALL research interests include the development of children's thinking in algebra, probability, and statistics.

Mathematics Teaching in the Middle School


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