10. Use counting to add to a group (A)

teaches Common Core State Standards CCSS.Math.Content.K.OA.A.1 http://corestandards.org/Math/Content/K/OA/A/1
teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1

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Lesson objective: Apply knowledge of counting, one more, and addition to solve a problem.

This lesson provides an opportunity for students to apply their knowledge and understanding of one-to-one counting, the concept of "one more," and addition as combining quantities to a real-life situation. Students are asked to help two characters figure out who won the game by finding an unknown addend.

Key Concept students will use:

• the concept that addition can be understood as adding to a group

Skills students will use:

• adding by putting groups together
• counting one-to-one (Grade K, Unit 1)
• finding one more than a given set

Students engage in Mathematical Practice 1 (Make sense of problems and persevere in solving them) as they use multiple skills to find a missing addend and find the answer to a multi-step problem.

Key vocabulary:

• change
• count
• zero

Special materials needed:

• counters or other manipulatives
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