3.N.2.5 Use addition and subtraction to solve real-world and mathematical problems involving whole numbers. Use various strategies, including the relationship between addition and subtraction, the use of technology, and the context of the problem to assess the reasonableness of results.
In a Nutshell
Students will use addition to problem solve and find solutions to real-world problems, by locating key terms in the story problem and determining the action needed to solve the problem. It is important for students to understand the key terms used and which action to take because as the students progress through the year, they will be asked to decipher if they will be adding, subtracting, or multiplying.
Student Actions
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Teacher Actions
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Demonstrate procedural fluency by developing a toolbox of strategies for solving real world problems.
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Develop a deep understanding by solving real world problems in multiple models. For example Students may draw a math picture/representation, write a number sentence, and/or write in words how they solved the problem.
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Make conjectures when solving real world problems by applying an appropriate mathematical technique.
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Communicate mathematically by checking their solutions using the opposite operations and share their reasoning with their peers.
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Pose purposeful questions to help students recall prior knowledge and justify their thinking. Questions may include: Which strategies can be used to solve this problem? How can we check our answer? What clues in the problem helped you solve?
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Implement tasks that encourage a variety of strategies to solve real world addition and subtraction problems.
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Facilitate mathematical discourse while students share a variety of approaches to the problem.
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Key Understandings
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Misconceptions
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All word problems are written in the same way. For example, A student recognizes that if there are 7 birds in a bush and 3 flies away, you can subtract to find out how many are left. However, she may be unable to solve a problem that involves the comparison of two amounts or the missing part of a whole.
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All word problems have keywords.
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They should add instead of subtracting or vice versa.
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OKMath Framework Introduction
3rd Grade Introduction
3rd Grade Math Standards
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