This resource is for KS4 students taking the Higher paper. It teaches students how to find the constant of proportionality and to use the full equation when one quantity is proportional to two others.
The lesson is in two parts and may be taught as two lessons. In the first part, students look at relationships when one quantity is directly proportional to two other quantities. This includes the ‘two painters take 5 days to paint 4 houses. …’ type of question as well as scientific questions. Students learn how to find the constant of proportionality and to formulate formulae. The first part of the lesson teaches students to find the subject of these formulae. The second part of the lesson teaches students to find and re-arrange formulae to find the value of other quantities.
There is a matching exercise to help the students develop their understanding. There are also examples for mini white board work. There is finally a worksheet consisting of questions for each of the two parts of the lesson. The lesson presentation includes solutions to the questions on the worksheet.
There is a resource that devlops the topic called ‘Combined Proportional Relationships II’.
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