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Lesson Plan

4. Comparing strategies to add mixed numbers (A)

teaches Common Core State Standards 4.3E
teaches Common Core State Standards 4.C.6
teaches Common Core State Standards CCSS.Math.Content.4.NF.B.3c
teaches Common Core State Standards CCSS.Math.Practice.MP3
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Lesson objective: Compare strategies for adding mixed numbers. 

This lesson provides an opportunity for students to apply their knowledge and understanding of adding mixed numbers to a mathematical situation. Students are asked to compare two strategies for adding mixed numbers and justify which method they believe works better. 

Key Concept students will use: 

  • Replacing a mixed number with an equivalent fraction and using the relationship between addition and subtraction can make it easier to add and subtract fractions with like denominators.

Skills students will use:

  • decomposing fractions; (Grade 3, Unit 4)
  • making whole numbers into equivalent fractions; (Grade 3, Unit 10)
  • decomposing mixed numbers

Students engage in Mathematical Practice 3 (Construct viable arguments and critique the reasoning of others) as they create examples and justify their choice of strategy for adding mixed numbers.

Key vocabulary: 

  • fraction
  • mixed number


Related content

Appears in

Solving addition and subtraction word problems involving fractions and mixed numbers

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