Title: Analyzing Secondary and Tertiary Changes in Percentages: Unveiling the Impact of Black Friday and Clothing Sales
Grade Level: 7th-9th grade
Learning Intention: Students will be able to apply their understanding of secondary and tertiary changes in percentages to real-life scenarios, such as Black Friday or clothing sales, in order to analyze the impact of discounts and price changes.
Duration: 45-60 minutes
Materials: - Whiteboard or blackboard - Markers or chalk - Handout with real-life scenarios (Black Friday and clothing sales) - Calculators (optional)
Lesson Outline:
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Introduction (5 minutes) a. Begin the lesson by asking students if they have ever heard of Black Friday or clothing sales. Discuss briefly what they know about these events and their purpose. b. Explain that in this lesson, they will explore how percentages play a crucial role in understanding the impact of discounts and price changes during such events.
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Review of Percentages (10 minutes) a. Recap the concept of percentages, ensuring students understand how to convert percentages to decimals and vice versa. b. Provide a few examples of calculating percentages, such as finding 20% of 80 or calculating a 15% discount on a $50 item.
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Secondary Changes in Percentages (15 minutes) a. Introduce the concept of secondary changes in percentages, explaining that it involves applying a percentage change to an already changed value. b. Use a real-life scenario, such as a Black Friday sale, to illustrate secondary changes. For example, if an item is initially discounted by 30% and then an additional 20% discount is applied, ask students to calculate the final price. c. Guide students through the calculation step-by-step, emphasizing the importance of applying the percentage changes in the correct order.
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Tertiary Changes in Percentages (15 minutes) a. Introduce the concept of tertiary changes in percentages, explaining that it involves applying a percentage change to a value that has already undergone two percentage changes. b. Use a real-life scenario, such as a clothing sale, to illustrate tertiary changes. For instance, if a shirt is initially priced at $60, discounted by 25%, and then an additional 10% discount is applied, ask students to calculate the final price. c. Guide students through the calculation step-by-step, emphasizing the importance of applying the percentage changes in the correct order.
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Application and Reflection (5 minutes) a. Distribute the handout with real-life scenarios involving Black Friday and clothing sales. b. In pairs or individually, ask students to solve the given problems using their understanding of secondary and tertiary changes in percentages. c. After completing the handout, discuss the solutions as a class, allowing students to share their approaches and reasoning. d. Conclude the lesson by reflecting on the importance of understanding secondary and tertiary changes in percentages when analyzing the impact of discounts and price changes in real-life scenarios.
Note: Throughout the lesson, encourage students to use calculators for complex calculations, but emphasize the importance of understanding the underlying concepts and steps involved in solving the problems.
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