#### Lesson Plan Archived

teaches Common Core State Standards CCSS.Math.Content.1.OA.A.2 http://corestandards.org/Math/Content/1/OA/A/2
teaches Common Core State Standards CCSS.Math.Content.1.OA.B.3 http://corestandards.org/Math/Content/1/OA/B/3
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7

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This lesson provides an opportunity for students to apply their knowledge and understanding of solving problems that involve addition of three addends to a real-world situation. Students are asked to help plan a community garden by selecting three different types of plants and the numbers of each plant type to put in the garden.

Key Concept students will use:

• We can add more than two numbers together.

Skills students will use:

• Solving addition and subtraction word problems within 10 (Grade K, Unit 6)
• Compose and decompose numbers less than or equal to 10 (Grade K, Unit 6)

Students engage in Mathematical Practice 7 (Look for and make use of structure) as they look for the structure in a number to find a way to decompose it into three smaller numbers to find three missing addends.

Key vocabulary:

• addends: one of the numbers in an indicated sum of two or more numbers (e.g., 4 + 3 + 1 = 8; 4, 3, and 1 are addends)
• addition: a mathematical operation of combining two or more numbers into a total or sum
• decompose: to break a number into smaller units to simplify computation
• sum: the result when two or more quantities are added
• total: the whole amount or value

Special materials needed:

• number lines (0-20)
• ten frames
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