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This challenge asks students to determine possible ways for combining stamps costing 15 and 33 cents to total 1 dollar 77 cents. It notes that this type of problem is similar to a process used for creating security codes. This online student activity is part of the Figure This! collection of 80 mathematical challenges. Students are encouraged to make a chart as they explore possible number combinations. The answer page describes and illustrates four different approaches to finding the solution, including making a combination chart and investigating possible number endings for multiples of 15 and 33. The Try These questions extend the challenge to exploring other number combinations. Information about the history of stamps with links to postal web sites is included. Copyright 2005 Eisenhower National Clearinghouse
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