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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.)
This resource was reviewed using the Curriki Review rubric and received an overall Curriki Review System rating of 2, as of 2009-08-13.
This resource received a 3* rating because it is part of Proportions, Ratios, and Percents, which received a rating of 3-Exemplary in the Curriki Review System and which you can see here: http://www.curriki.org/xwiki/bin/view/Coll_Group_ImplementingAlgebra/ProportionsRatiosandPercents