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Valentine Cards: Exploring Relationships Between Variables

In this interactive from Annenberg Learner’s Teaching Math, learn a technique to figure out the total number of valentines exchanged among students in different-sized classes. In the accompanying classroom activity, students examine a recursive pattern and will use reasoning to find the mathematical rule that governs it. In trying to figure out how to extend the pattern to increasingly large numbers—and, eventually, to find a rule—students will learn that modeling a situation by creating a similar, easier problem is a good problem-solving technique.

See this activity on Annenberg Learner's professional development course for teachers.

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