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Equations―Addition and Subtraction Date: 4/24/14 264 ©2013CommonCore,Inc. Some rights reserved.commoncore.org This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. NYS COMMON CORE MATHEMATICS CURRICULUM 6•4Lesson 26 Lesson 26:One-Step Equations―Addition and Subtraction Student Outcomes Students solve one-step equations by relating an equation to a diagram. Students check to determine if their solution makes the equation true. Lesson Notes This lesson serves as a means for students to solve one-step equations through the use of tape diagrams. Through the construction of tape diagrams, students create algebraic equations and solve for one variable. In this lesson, students continue their study of the properties of operations and identity anddevelop intuition of the properties of equality. This lesson continues the informal study of the properties of equality students have practiced since first grade and also serves as a springboard to the formal study, use, and application of the properties of equality seen in seventh grade. While students will intuitively use the properties of equality, understand that diagrams are driving the meaning behind the content of this lesson. This lesson purposefully omits focus on the actual properties of equality, which is reserved for Grade 7.Students will relate an equation directly to diagrams and verbalize what they do with diagrams to construct and solve algebraic equations. Classwork Opening (3 minutes) In order for students to learn how to solve multi-step equations (in future grades), they must first learn how to solve basic equations. Although a majority of students have the ability to find the solution to the equations using mental math, it is crucial they understand the importance of knowing and understanding the process so they can apply it to more complex equations in the future. Mathematical Modeling Exercise (8 minutes) Model the example to show students how to use tape diagrams to calculate solutions to one-step equations. Calculate the solution: Draw two tape diagrams that are the same length. Label the first tape diagram . MP. 3 & MP. 4
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Lesson 26: One-Step
Equations―Addition and Subtraction Date: 4/24/14 265 ©2013CommonCore,Inc. Some rights reserved.commoncore.org This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. NYS COMMON CORE MATHEMATICS CURRICULUM 6•4Lesson 26 Represent on the second tape diagram. What must the remaining section of the tape diagram represent? How do you know? The remaining part of the tape diagram represents because the entire tape diagram is and we know one section is . Therefore, we can compute the difference, , to determine the remaining part. Label your tape diagram. Draw another set of tape diagrams to represent the given equation: Because both of the following tape diagrams represent the same value, what would the value of be? Explain. Since both of the tape diagrams represent the same value, both parts that have and must represent the same value. Therefore, must be . Using this knowledge, try to show or explain how to solve equations without tape diagrams.What actually happened when constructing the tape diagrams? Guide and promote this discussion with students: The first set of tape diagrams shows that the quantity of is equal to 8. To write this algebraically, we can use the equal sign. . The second set of tape diagrams shows two things:first, that is equal to , and alsothat is equal to . We found that the only number that can represent in the equation is .Therefore, when , the only solution for is . In previous lessons we discussed identity properties. How can we explain why using the identity properties? We know that when we add a number, then subtract the same number, the result is the original number. Previously, we demonstrated this identity with . How can we check our answer? Substitute in for to determine if the number sentence is true. is a true number sentence, because resulting in So, our answer is correct. MP. 3 & MP. 4
3.
Lesson 26: One-Step
Equations―Addition and Subtraction Date: 4/24/14 266 ©2013CommonCore,Inc. Some rights reserved.commoncore.org This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. NYS COMMON CORE MATHEMATICS CURRICULUM 6•4Lesson 26 Exercise 1 (8 minutes) Students work with partners to complete the following problems. They will show how to solve each equation using tape diagrams and algebraically. Then, students will use substitution to check their answers after each problem. Exercise 1 Solve each equation. Use both tape diagrams and algebraic methods for each problem. Use substitution to check your answers. a. Algebraically: Check: ; .This is a true number sentence, so is the correct solution.
4.
Lesson 26: One-Step
Equations―Addition and Subtraction Date: 4/24/14 267 ©2013CommonCore,Inc. Some rights reserved.commoncore.org This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. NYS COMMON CORE MATHEMATICS CURRICULUM 6•4Lesson 26 b. Algebraically: Check: ; . This is a true number sentence, so is the correct solution.
5.
Lesson 26: One-Step
Equations―Addition and Subtraction Date: 4/24/14 268 ©2013CommonCore,Inc. Some rights reserved.commoncore.org This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. NYS COMMON CORE MATHEMATICS CURRICULUM 6•4Lesson 26 Exercise 2 (8 minutes) Students use the knowledge gained in the first part of the lesson to determine how to solve an equation with subtraction. Exercise 2 Given the equation : a. Demonstrate how to solve the equation using tape diagrams. b. Demonstrate how to solve the equation algebraically. c. Check your answer. ; . This is a true number sentence, so our solution is correct. Provide students time to work and then show some examplesthatshowhow to solve the equation using both methods. At this time, remind students of the identity with subtraction to explain why MP. 4
6.
Lesson 26: One-Step
Equations―Addition and Subtraction Date: 4/24/14 269 ©2013CommonCore,Inc. Some rights reserved.commoncore.org This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. NYS COMMON CORE MATHEMATICS CURRICULUM 6•4Lesson 26 Exercise 3 (8 minutes) Students solve each problem using the method of their choice, but they must show their work. Have students check their answers. Example 3 Solve each problem and show your work. You may choose which method (tape diagrams or algebraically) you prefer. Check your answers after solving each problem. a. Tape Diagram: Algebraically: Check: ; . This is a true number sentence so our answer is correct.
7.
Lesson 26: One-Step
Equations―Addition and Subtraction Date: 4/24/14 270 ©2013CommonCore,Inc. Some rights reserved.commoncore.org This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. NYS COMMON CORE MATHEMATICS CURRICULUM 6•4Lesson 26 b. Algebraically: Check: ; . This is a true number sentence, so our solution is correct. c. Algebraically: Check: ; . This number sentence is true, so our solution is correct.
8.
Lesson 26: One-Step
Equations―Addition and Subtraction Date: 4/24/14 271 ©2013CommonCore,Inc. Some rights reserved.commoncore.org This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. NYS COMMON CORE MATHEMATICS CURRICULUM 6•4Lesson 26 Closing (5 minutes) John checked his answer and found that it was incorrect.John’s work is below.What did he do incorrectly? Use a tape diagram to show why John’s method does not lead to the correct answer. Why do you do the inverse operation to calculate the solution of the equation? Include a tape diagram as part of your explanation. Exit Ticket (5 minutes)
9.
Lesson 26: One-Step
Equations―Addition and Subtraction Date: 4/24/14 272 ©2013CommonCore,Inc. Some rights reserved.commoncore.org This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. NYS COMMON CORE MATHEMATICS CURRICULUM 6•4Lesson 26 Name Date Lesson 26: One-Step Equations—Addition and Subtraction Exit Ticket 1. If you know the answer, state it. Then use a tape diagram to demonstrate why this is the correct answer. If you do not know the answer, find the solution using a tape diagram. 2. Find the solution to the equation algebraically. Check your answer.
10.
Lesson 26: One-Step
Equations―Addition and Subtraction Date: 4/24/14 273 ©2013CommonCore,Inc. Some rights reserved.commoncore.org This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. NYS COMMON CORE MATHEMATICS CURRICULUM 6•4Lesson 26 Exit Ticket Sample Solutions 1. If you know the answer, state it. Then use a tape diagram to demonstrate why this is the correct answers. If you do not know the answer, find the solution using a tape diagram. is equal to ; Check: ; .This is a true number sentence, so the solution is correct. 2. Find the solution to the equation algebraically. Check your answer. Check: ; .This is a true number sentence, so the solution is correct.
11.
Lesson 26: One-Step
Equations―Addition and Subtraction Date: 4/24/14 274 ©2013CommonCore,Inc. Some rights reserved.commoncore.org This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. NYS COMMON CORE MATHEMATICS CURRICULUM 6•4Lesson 26 Problem Set Sample Solutions 1. Find the solution to the equation below using tape diagrams. Check your answer. is equal to Check: ; . This number sentence is true, so the solution is correct. 2. Find the solution of the equation below algebraically. Check your answer. Check: ; .This number sentence is true, so the solution is correct. 3. Find the solution of the equation below using tape diagrams. Check your answer. Check: ; . This number sentence is true, so the solution is correct. 4. Find the solution to the equation algebraically. Check your answer.
12.
Lesson 26: One-Step
Equations―Addition and Subtraction Date: 4/24/14 275 ©2013CommonCore,Inc. Some rights reserved.commoncore.org This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. NYS COMMON CORE MATHEMATICS CURRICULUM 6•4Lesson 26 Check: ; . This number sentence is true, so the solution is correct. 5. Find the solution to the equation using the method of your choice. Check your answer. Tape Diagrams: Algebraically: Check: ; This number sentence is true, so the solution is correct. 6. Identify the mistake in the problem below. Then, correct the mistake. The mistake is subtracting rather than adding . This is incorrect because would not equal . 7. Identify the mistake in the problem below. Then, correct the mistake. The mistake is adding on the right side of the equation instead of subtracting it from both sides.
13.
Lesson 26: One-Step
Equations―Addition and Subtraction Date: 4/24/14 276 ©2013CommonCore,Inc. Some rights reserved.commoncore.org This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. NYS COMMON CORE MATHEMATICS CURRICULUM 6•4Lesson 26 8. Match the equation with the correct solution on the right.
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