Lesson plan

# 6. Solve word problems with three addends (A)

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.MP2 http://corestandards.org/Math/Practice/MP2
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7

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Lesson objective: This lesson provides an opportunity for students to apply their knowledge and understanding of addition of three addends in any order to a real-life situation. Students are asked to make a plan and two possible schedules for spending tickets at the carnival.

Key Concept students will use:

• When we are adding numbers together, it doesn't matter what order they are written in.

Skills students will use:

Students engage in Mathematical Practice 2 (Reason abstractly and quantitatively) as they determine different number combinations that are less than or equal to 20 tickets. Students will also engage in Mathematical Practice 7 (Look for and make use of structure) as they manipulate the number 20 to determine the three missing addends.

Key vocabulary:

• addend: 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

• equal: having the same amount, size, number, or value

• equation: a mathematical sentence stating that two expressions are equal
• number line: a line on which a point represents a value or number

• order: to place numbers or objects in a sequential arrangement (e.g., least to greatest or heaviest to lightest)

• sum: the result when two or more quantities are added

• total: the whole amount or value

Special materials needed:

• number lines (0-20)
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• 6. Solve word problems with three addends (A)