Brainstorm (group)(15 minutes)
- In groups of 4, students brainstorm and write down; on whiteboards/butchers paper- common everyday examples of rates/indirect proportion, or where rates/indirect proportion appear in their everyday lives (e.g. an example of indirect proportion occurs when cars accelerate) (students can use internet research)
- Each group will present what they have written to the class (assessment strategy)
- Teacher chooses some ideas and asks the student to explain it, getting students to use vocabulary such as, as the car accelerates (speed increases) the time it takes for the car to travel a certain distance decreases (see additional resources for literacy activity) (literacy) (AFL)
Teacher questioning/prompts
- Think about the definition of a inversely proportional graph
- If increasing one thing decreases another, then what about the opposite? Is that also true?
Activity: Interpreting direct and indirect proportional graphs (group) (30 minutes)
- In groups of 4 students will play the 'matching cards activity' (rules provide in link) which gets students to recognise different graphs and match them with a scenario (include equations for extension)
- As a class go over the answers. Teacher picks a student to say there answer for a scenario (AFL)
Teacher questioning/prompts
- If you think about it logically, would this scenario be correctly represented by this graph?
- Can you explain what this graph is saying (what the relationship between the x and y axis is)?
Lesson conclusion: Exit slip (5 minutes)
- Students receive an exit slip which they complete and hand in to the teacher before leaving the class (AFL)