I’ve adapted a Rich task on ratio I found on the East Midlands Maths page for our KS3 Scheme of Work recently. I’ve used this with pupils tackling in groups, although it could also be a paired activity.
The task introduces/ assesses pupils basic knowledge of ratio and proportion in the context of mixing red and white paint to make Pink Paint.The basis of the task is a card matching activity – I’ve tried to add in some common misconceptions and ensure that the groups are unequal in amount of cards. For some groups pupils may have to draw matching pictures. As a second part of the activity I ask pupils to rank their sets from the darkest to the lightest shade.
I also created an extension task which feeds nicely into splitting quantities in a given ratio.
Let me know what you think if you use this by leaving a comment below.