Lesson plan

4. Comparing strategies to add mixed numbers (A)

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.MP3 http://corestandards.org/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