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Lesson Plan

10. Comparing strategies of addition and subtraction to look for efficiency (A)

teaches Common Core State Standards 3.4A
teaches Common Core State Standards 3.C.1
teaches Common Core State Standards CCSS.Math.Content.3.NBT.A.2
teaches Common Core State Standards CCSS.Math.Practice.MP7
teaches Common Core State Standards MAFS.3.NBT.1.2
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Lesson objective: Compare strategies for adding and subtracting to look for efficient strategies.

This lesson provides an opportunity for students to apply their knowledge and understanding of place value and decomposition to a mathematical situation. Students are asked to compare student strategies to look for efficient strategies of addition and subtraction.

Key Concept students will use: 

  • Use place value understanding and decomposition to add and subtract using a variety of strategies.

Skills students will use:

  • Use concrete models and drawings to understand that it is sometimes necessary to compose and decompose numbers when adding and subtracting. (Grade 2, Unit 11)
  • Use counting up (recognizing the inverse relationship of addition and subtraction) to solve subtraction problems.
  • Using decomposing to strategically count up or compensate numbers to make adding or subtracting more efficient.

Students engage in Mathematical Practice 7 (Look for and make use of structure) as they decompose numbers using their place values, and they use those values in different ways to most efficiently solve a subtraction problem.

Key vocabulary: 

  • compensation
  • decompose
  • difference
  • efficient

Special materials needed:

  • base ten blocks
Related content

Appears in

Developing strategies for addition and subtraction

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