Lesson plan

8. Barnyard Battle: Practice Solving Addition and Subtraction Problems Using a Number Line (FP)

teaches Common Core State Standards CCSS.Math.Content.2.OA.A.1 http://corestandards.org/Math/Content/2/OA/A/1
teaches Common Core State Standards CCSS.Math.Practice.MP5 http://corestandards.org/Math/Practice/MP5
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7

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Lesson objective: Use number line diagrams to solve addition and subtraction problems which describe "adding to" or "taking from" situations with a missing result, start, or change.

This lesson helps to build fluency with whole number addition and subtraction. Number line diagrams are used here because they highlight part-whole relationships and support the strategy of "counting on" to find a missing addend or "counting back" to subtract. This work develops students' understanding that we can use a number line to solve many types of addition and subtraction problems.

Students engage in Mathematical Practice 6 (Attend to precision) as they label number line diagrams precisely. They also engage in Mathematical Practice 7 (Look for and make use of structure) as they look for number patterns and relationships on the number lines to develop computational strategies.

Key vocabulary:

  • addend
  • count back
  • count on
  • difference
  • number line diagram
  • terms for main types of addition and subtraction situations: add to; take from (* Students do not have to master these terms; however, they may facilitate conversation.)

Special materials needed:

  • blank number line diagrams (optional)