Lesson plan

# 7. Apply subtraction strategies to solve real-world problems (A)

teaches Common Core State Standards CCSS.Math.Content.K.OA.A.2 http://corestandards.org/Math/Content/K/OA/A/2
teaches Common Core State Standards CCSS.Math.Content.K.OA.A.5 http://corestandards.org/Math/Content/K/OA/A/5
teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1
teaches Common Core State Standards CCSS.Math.Practice.MP8 http://corestandards.org/Math/Practice/MP8

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Lesson objective: Apply subtraction strategies to solve real-world problems.

This lesson provides an opportunity for students to apply their knowledge and understanding of subtraction strategies to a real-life situation. Students are asked to find out how many puppies are left at the shelter after some are adopted, using addition strategies.

Key Concept students will use:

• The meaning of subtraction does not change when different strategies are used.

Skills students will use:

• count on strategy
• number partners strategy

Students engage in Mathematical Practice 1 (Make sense of problems and persevere in solving them) as they use the number bonds and take away strategies to solve a real-world problem. Students show their understanding of subtraction as taking apart and taking away.

Key vocabulary:

• number bond

Special materials needed:

• none