Lesson plan

# 6. Solving Problems Using a Number Line (A)

teaches Common Core State Standards CCSS.Math.Content.2.MD.B.5 http://corestandards.org/Math/Content/2/MD/B/5
teaches Common Core State Standards CCSS.Math.Practice.MP5 http://corestandards.org/Math/Practice/MP5

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Lesson objective: Solve problems by using a number line to add and subtract lengths.

This lesson provides an opportunity for students to apply their knowledge and understanding of addition and subtraction to a real-life situation. Students are asked to plan the arrangement of shelves on a bookcase given the heights of the books that need to fit on the shelves, and then create a diagram to show their arrangements.

Key Concept students will use:

• a number line to solve many types of addition and subtraction related to length.

Skills students will use:

• representing numbers as lengths on a number line.
• using a number line diagram as a tool to add and subtract lengths.

Students engage in Mathematical Practice 5 (Use appropriate tools strategically) as they use a number line diagram as a tool to anchor addition and subtraction work.

Key vocabulary:

• number line diagram
• count on/count back

Special materials needed:

• blank number lines (optional)