Objectives (5 - 7 minutes)

The teacher will:

1. Introduce the topic of multi-step inequalities with a brief overview of the concept of inequalities.
2. Clearly state the learning objectives for the lesson. These objectives include:
   • Understanding the basic idea of inequalities and how they differ from equations.
   • Learning how to solve multi-step inequalities by using the properties of inequalities, including addition, subtraction, multiplication, and division.
   • Applying the skills acquired to solve real-world problems involving multi-step inequalities.
3. Explain that by the end of the lesson, the students should be able to solve multi-step inequalities independently and accurately, and recognize the relevance of this skill in real-world situations.
4. Encourage the students to ask questions and participate actively in the lesson to ensure a clear understanding of the topic.

Introduction (10 - 15 minutes)

The teacher will:

1. Begin by reminding students of the basic concept of equations and inequalities, which they learned in previous classes. The teacher will use a simple equation and inequality example on the board, such as "3x + 5 = 20" and "3x + 5 > 20", to refresh the students' memory and ensure they understand the difference between the two concepts. (2-3 minutes)

2. Present two problem situations to the students that will serve as starters for the main topic:

   • The teacher can ask, "If a store has a sale where all items are at least 30% off, what kind of inequality can we use to represent this situation?" (2-3 minutes)
   • For a second problem, the teacher can ask, "If you have $50 and want to buy a pair of shoes that cost $30, how much more money do you need?" The teacher will then write the inequality "50 - x ≥ 30" on the board and explain that this is an example of a multi-step inequality. (2-3 minutes)

3. Contextualize the importance of the subject by explaining its real-world applications. The teacher can mention that inequalities are widely used in economics, business, and social sciences to model real-world situations. For instance, in economics, inequalities are used to represent budgets, profit margins, and sales discounts. (2-3 minutes)

4. Introduce the topic of multi-step inequalities in a fun and engaging way. The teacher can use the following attention-grabbing introduction:

   • "Imagine you are participating in a game show, and the host tells you that you can win a car if you can solve a series of math problems. The first problem is simple, just an addition or subtraction. The second problem is a bit more complicated, involving multiplication or division. And the third problem is trickier, it's a multi-step inequality! Can you solve it and win the car?" (2-3 minutes)

5. Encourage the students to think about other situations where they might encounter multi-step inequalities in their daily life, such as budgeting, time management, or sports scores. This will help the students to see the relevance of the topic and engage them in the learning process. (1 minute)

Development (20 - 25 minutes)

The teacher will:

1. Begin the development stage by breaking down the concept of multi-step inequalities into its constituent components. The teacher will clarify that a multi-step inequality is an inequality that requires more than one operation to solve, such as addition, subtraction, multiplication, or division. (2-3 minutes)

2. Present a step-by-step guide on how to solve multi-step inequalities, using the following example: 3x + 5 > 20. The teacher will:

   • Explain the importance of isolating the variable, similar to solving equations. (2-3 minutes)
   • Demonstrate the process of isolating the variable by subtracting 5 from both sides, resulting in 3x > 15. The teacher will emphasize that when subtracting from both sides, the inequality sign does not change. (2-3 minutes)
   • Introduce the division property of inequalities and apply it to the inequality by dividing by 3, which yields x > 5. (2-3 minutes)
   • Highlight the significance of recognizing that the variable can take on any value greater than 5, rather than a specific value as in the case of solving equations. (2-3 minutes)

3. Move on to more complex examples of multi-step inequalities, using the same step-by-step approach to guide the students through the process. The teacher may also use graphical representations to help students visualize the solution sets. (8-10 minutes)

4. Discuss the importance of checking the solution to an inequality, as the solution is often a range of values rather than a single number. The teacher can illustrate this with an example and explain that checking a solution involves substituting a value from the solution set back into the original inequality and verifying that it holds true. (3-4 minutes)

5. Provide a variety of real-world applications for multi-step inequalities. For example:

   • In a business context, the teacher can explain that multi-step inequalities can be used to model the profit or loss of a company, taking into account different factors such as costs, sales, and taxes.
   • In a personal finance context, the teacher can discuss how multi-step inequalities can be used to set budgets, plan savings, or determine loan payments.
   • In a sports context, the teacher can explain how multi-step inequalities can be used to determine the number of games a team must win to make the playoffs, considering the number of games remaining and the records of the other teams. (3-4 minutes)

6. Conclude the development stage by encouraging students to ask questions and engage in a brief discussion about the topic. The teacher will summarize the main points of the lesson and remind students of the steps to follow in order to solve multi-step inequalities. (2-3 minutes)

Feedback (5 - 7 minutes)

The teacher will:

1. Begin the feedback stage by assessing what was learned during the lesson. The teacher will ask a few students to summarize the main points of the lesson and explain in their own words how to solve multi-step inequalities. This step allows the teacher to gauge the students' understanding and address any misconceptions. (2-3 minutes)

2. Encourage the students to reflect on the real-world applications of multi-step inequalities discussed during the lesson. The teacher can ask the students to think about how they might use these concepts in their daily lives, such as in budgeting, shopping, or planning for a trip. This step is crucial in helping students to see the relevance of the topic and its applicability beyond the classroom. (1-2 minutes)

3. Propose a quick problem-solving activity to allow the students to apply what they have learned. The teacher can write a multi-step inequality on the board and ask the students to solve it individually. For instance, the teacher can write "2x + 3 > 7 - x" and ask the students to solve for x. The teacher will then ask a few students to share their solutions and explain their thought process. This activity helps to reinforce the learning objectives and gives the teacher an opportunity to provide immediate feedback on the students' work. (2-3 minutes)

4. Conclude the feedback stage by inviting the students to ask any remaining questions and share their thoughts on the lesson. The teacher will emphasize that it is normal to find multi-step inequalities challenging at first, but with practice and a clear understanding of the concept, they can become much easier to solve. The teacher can also suggest additional resources, such as online tutorials or practice problems, for students who want to further their understanding of the topic. (1-2 minutes)

Conclusion (3 - 5 minutes)

The teacher will:

1. Summarize the main points of the lesson, recapping the concept of multi-step inequalities and the steps to solve them. The teacher will emphasize the importance of understanding the difference between an equation and an inequality, the necessity to isolate the variable, and how to apply the properties of inequalities, such as addition, subtraction, multiplication, and division. (1-2 minutes)

2. Explain how the lesson connected theory, practice, and applications. The teacher will remind students that they started with the theoretical understanding of inequalities, then practiced solving different types of multi-step inequalities, and finally, applied what they learned to real-world situations. The teacher will underscore the importance of this connection, as it helps students to see the relevance of what they are learning and how it can be applied in practical contexts. (1 minute)

3. Suggest additional materials for students to further their understanding of multi-step inequalities. The teacher can recommend relevant sections in the textbook, online resources like Khan Academy, which provide video tutorials and practice problems, and worksheets with a variety of multi-step inequality problems for extra practice. The teacher can also suggest that students look for real-world examples of multi-step inequalities in newspaper articles, business reports, or other sources, and try to solve them. (1 minute)

4. Conclude by emphasizing the importance of mastering multi-step inequalities for their overall math skills and future education. The teacher can explain that the ability to solve multi-step inequalities is a fundamental math skill that will be needed in more advanced math courses, as well as in other subjects like physics, economics, and engineering. The teacher can also stress that the problem-solving skills they learned in this lesson, such as breaking down complex problems into smaller, more manageable steps, and checking their solutions, are valuable skills that can be applied in many areas of life. (1-2 minutes)