Lesson plan

Subtract within 20 by using addition

teaches Common Core State Standards CCSS.Math.Content.2.OA.B.2 http://corestandards.org/Math/Content/2/OA/B/2
teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7

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Big Ideas: There are many different ways to solve subtraction problems. In this lesson, students will subtract within 20 by using addition. This lessons builds on and deepens the students' understanding of the relationship between addition and subtraction. This task will have students model why addition can be used to solve subtraction problems. Vocabulary: addition, subtraction, sum, difference Special Materials: snap cubes counters ten frames (optional)