Lesson plan

9. Subtracting mixed numbers (FP)

teaches Common Core State Standards CCSS.Math.Content.4.NF.B.3c http://corestandards.org/Math/Content/4/NF/B/3/c
teaches Common Core State Standards CCSS.Math.Practice.MP2 http://corestandards.org/Math/Practice/MP2
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Lesson objective: Practice subtracting mixed numbers by decomposing the minuend into an equivalent mixed number.

This lesson helps to build procedural skill with adding mixed numbers. Deliberate use of vocabulary is used here because it supports the connection between a mixed number as a single number and as a sum of a whole number and a fraction. This work develops students' understanding that replacing a mixed number with an equivalent sum and using a model to understand the equivalent relationship between the two forms of the number

Students engage in Mathematical Practice 4 (model with mathematics) as they use diagrams to see the relationship between equivalent numbers.

Key vocabulary:

  • fraction
  • mixed number