Students make like units for all addends or both minuend and subtrahend. First, they draw a wide rectangle and partition it with vertical lines as they would a tape diagram, representing the first fraction with a bracket and shading. They then partition a second congruent rectangle with horizontal lines to show the second fraction. Next, they partition both rectangles with matching lines to create like units.
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From EngageNY.org of the New York State Education Department. Grade 5 Mathematics Module 3, Topic B Overview.
Available from engageny.org/resource/grade-5-mathematics-module-3-topic-b-overview; accessed 2015-05-29.
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