Extra materials for Lesson 2.2

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2.2 Bellwork

by Kevin Hall

Beginning-of-class Bellwork for Lesson 2.2. Activates prior knowledge of unit rates (a major topic in 2.2).
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Companion PowerPoint for 2.2 Bellwork. Free yourself to walk the room while students work. Let the computer stay in front of the class and do the "writing" for you.
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When enlarging a picture to make a mural, should you multiply each dimension by a given amount, or add the given amount to each dimension? Students try using both methods to enlarge a simple picture and discover that multiplying keeps the shapes in the picture proportional. This is a practical application of the equivalent fractions method discovered in Lesson 2.1. (If a group finishes 2.2 early, and has ALREADY mastered the 2.1 Flashcards, then this extension is for them.)
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