Lesson plan

4. Subtract fractions with like denominators

teaches Common Core State Standards CCSS.Math.Content.4.NF.B.3a http://corestandards.org/Math/Content/4/NF/B/3/a
teaches Common Core State Standards CCSS.Math.Content.4.NF.B.3b http://corestandards.org/Math/Content/4/NF/B/3/b
teaches Common Core State Standards CCSS.Math.Practice.MP2 http://corestandards.org/Math/Practice/MP2
teaches Common Core State Standards CCSS.Math.Practice.MP4 http://corestandards.org/Math/Practice/MP4

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Procedural skills lesson: This lesson helps to build procedural skill in subtracting fractions with like denominators. Students work toward this goal in 3 ways: 1. By using their understanding of decomposing fractions into unit and non-unit fractions with the same denominator. 2. Through the use of taking apart lengths and finding differences on the number lines. 3. By finding missing values to make true equations. Students engage in Mathematical Practice 4 (modeling with mathematics) by modeling subtraction using lengths on a number line. This is especially important in the practice section of the lesson as students verify parts and wholes using the understanding that the size of the unit lengths does not change when subtracting fractions with like denominators. Mathematical Practice 2 (reason abstractly and quantitatively) is important as students reason about fractions with and without the support of a number line. Special Materials: