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lesson 17
1 hour

Add And Subtract Fractions With Same Units


Description

Objective:  Use visual models to add and subtract two fractions with the same units, including subtracting from one whole.

In Lesson 17, students decompose a whole into a fraction having the same denominator as the subtrahend. For example, 1 – 4 fifths becomes 5 fifths – 4 fifths = 1 fifth, connecting with Topic B skills. They then see that, when solving 1 2/5 – 4/5 , they have a choice of subtracting 4/5 from 7/5 or from 1. Students model with tape diagrams and number lines to understand and then verify their numerical work.

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Credits

From EngageNY.org of the New York State Education Department. Grade 4 Mathematics Module 5, Topic D, Lesson 17. Available from engageny.org/resource/grade-4-mathematics-module-5-topic-d-lesson-17; accessed 2015-05-29.
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