Graphing direct proportion
I can recognise direct proportion graphically and be able to identify features of the graph.
Graphing direct proportion
I can recognise direct proportion graphically and be able to identify features of the graph.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- Direct proportion can be recognised graphically.
- A direct proportion graph is always a straight line.
- The origin is always a point on a direct proportion graph.
- The gradient tells us the constant of proportionality.
- Using these features it is possible to identify direct proportion graphs.
Keywords
Direct proportion - Two variables are in direct proportion if they have a constant multiplicative relationship.
Common misconception
Assuming that any graph with a constant positive gradient represents variables that are in direct proportion.
Encourage the useful check of reading a pairs of values from the graph, doubling one of them and checking the graph to see if the other variable has doubled. If it has it shows a directly proportional relationship if not it doesn't.
To help you plan your year 8 maths lesson on: Graphing direct proportion, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 8 maths lesson on: Graphing direct proportion, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
We use learning cycles to break down learning into key concepts or ideas linked to the learning outcome. Each learning cycle features explanations with checks for understanding and practice tasks with feedback. All of this is found in our slide decks, ready for you to download and edit. The practice tasks are also available as printable worksheets and some lessons have additional materials with extra material you might need for teaching the lesson.
The assessment exit quiz will test your pupils' understanding of the key learning points.
Our video is a tool for planning, showing how other teachers might teach the lesson, offering helpful tips, modelled explanations and inspiration for your own delivery in the classroom. Plus, you can set it as homework or revision for pupils and keep their learning on track by sharing an online pupil version of this lesson.
Explore more key stage 3 maths lessons from the Understanding multiplicative relationships: percentages and proportionality unit, dive into the full secondary maths curriculum, or learn more about lesson planning.
Licence
Starter quiz
6 Questions








Exit quiz
6 Questions









