Lesson plan

10. Solve addition and subtraction problems mentally (A)

teaches Common Core State Standards CCSS.Math.Content.2.NBT.B.5 http://corestandards.org/Math/Content/2/NBT/B/5
teaches Common Core State Standards CCSS.Math.Practice.MP6 http://corestandards.org/Math/Practice/MP6
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Lesson objective: Solve addition and subtraction problems mentally.

This lesson provides an opportunity for students to apply their knowledge and understanding of addition and subtraction strategies to a real-world situation. Students are asked to mentally calculate if Sam can afford all three snacks and how much change she should receive.

Key Concept students will use: 

  • The strategy we use to add or subtract does not change the total or difference. 

Skills students will use:

  • Using Addition and Subtraction Strategies  (Grade 1, Unit 6)
  • Adding and Subtracting Within 100 (Grade 2, Unit 1)

Students engage in Mathematical Practice 6 (Attend to precision) as they solve addition and subtraction problems mentally.

Key vocabulary: 

  • mentally
  • difference
  • total