Percentage Increase and Decrease
Students will calculate percentage increases and decreases, applying them to various contexts like sales and growth.
Key Questions
- Why is a 10 percent increase followed by a 10 percent decrease not the same as the original price?
- Analyze the impact of successive percentage changes on an initial value.
- Construct a problem involving a percentage increase or decrease in a real-world context.
ACARA Content Descriptions
About This Topic
Representation and Reality asks Year 9 students to look behind the screen and analyze how media shapes our understanding of the world. They investigate how different social groups, including First Nations peoples, women, and multicultural communities, are portrayed in mainstream media. This topic aligns with ACARA's focus on analyzing media representations and the ethical responsibilities of media makers.
Students explore the concept of 'the gaze' and how framing, lighting, and casting can reinforce or challenge cultural stereotypes. This topic is highly discussion-based and benefits from collaborative investigations where students 'audit' current media (like news or advertising) to see whose voices are missing. Active learning allows them to move from passive consumption to critical analysis, helping them to become more ethical creators themselves.
Active Learning Ideas
Inquiry Circle: The Media Audit
In small groups, students analyze a week's worth of a specific news program or a popular streaming service. They must tally the representation of different genders, ethnicities, and ages, then present their findings to the class.
Formal Debate: The Ethics of Casting
Students debate a real-world scenario where an actor was cast to play a character from a different cultural background. They must use terms like 'cultural appropriation' and 'authentic representation' in their arguments.
Role Play: The Script Doctor
Students are given a script full of clichés and stereotypes. They must work in pairs to 'rewrite' the scene to make the characters more complex and realistic, then explain their changes to the 'Producer' (the teacher).
Watch Out for These Misconceptions
Common MisconceptionMedia is just 'entertainment' and doesn't affect real life.
What to Teach Instead
Media representations shape our subconscious biases. Active 'deconstruction' of ads helps students see how repeated images create 'norms' that affect how we treat people in the real world.
Common MisconceptionIf a representation is 'positive', it's always good.
What to Teach Instead
Even 'positive' stereotypes (like the 'tech-savvy Asian') can be limiting. Peer discussions help students understand that 'complexity' is the goal of good representation, not just 'niceness'.
Suggested Methodologies
Ready to teach this topic?
Generate a complete, classroom-ready active learning mission in seconds.
Frequently Asked Questions
How do I talk about stereotypes without offending students?
How can active learning help students understand representation?
What is 'The Gaze' in media arts?
How does this link to ACARA standards?
Planning templates for Mathematics
5E Model
The 5E Model structures lessons through five phases (Engage, Explore, Explain, Elaborate, and Evaluate), guiding students from curiosity to deep understanding through inquiry-based learning.
unit plannerMath Unit
Plan a multi-week math unit with conceptual coherence: from building number sense and procedural fluency to applying skills in context and developing mathematical reasoning across a connected sequence of lessons.
rubricMath Rubric
Build a math rubric that assesses problem-solving, mathematical reasoning, and communication alongside procedural accuracy, giving students feedback on how they think, not just whether they got the right answer.
More in Financial Mathematics and Proportion
Percentages and Fractions Review
Students will review converting between percentages, fractions, and decimals, and calculating percentages of amounts.
2 methodologies
Profit and Loss
Students will calculate percentage profit and loss, and determine original values after a percentage change in business scenarios.
2 methodologies
Simple Interest Calculations
Students will calculate interest earned or paid over time using the simple interest formula (I=PRN).
2 methodologies
Finding Principal, Rate, or Time (Simple Interest)
Students will rearrange the simple interest formula to find unknown principal, interest rate, or time.
2 methodologies
Introduction to Ratios
Students will understand and simplify ratios, expressing them in their simplest form and using them to compare quantities.
2 methodologies