Lesson plan

10. Using a number line to solve two-step addition and subtraction problems (A)

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.MP7 http://corestandards.org/Math/Practice/MP7

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Lesson objective: Solve 2-step story problems that involve addition and/or subtraction using a number line.

This lesson provides an opportunity for students to apply their knowledge and understanding of modeling addition and subtraction problems on a number line diagram to a real-life situation. Students are asked to write equations and draw number line diagrams to solve a problem with a multi-step solution. 

Key Concept students will use: 

  • We can use a number line to solve many types of addition and subtraction problems.

Skills students will use:

  • create an addition or subtraction equation with an unknown to represent a problem situation (Grade 1, Unit 18) 
  • model addition and subtraction using a number line diagram

Students engage in Mathematical Practice 7 (Look for and make use of structure) as they look for number patterns and relationships on the number line to develop computational strategies.

Key vocabulary: 

  • addend
  • compare
  • number line diagram
  • unknown

Special materials needed:

  • blank number line diagrams (optional)