This unit of work is on the probability of combined events

Students often struggle with combined event problems although calculating probabilities for these is similar process to that of single events in that it amounts to counting up the number of equally likely outcomes that fit a particular situation.

In this unit we will use possibility space diagrams and explore how probabilities can be calculated using fraction arithmetic.

We will explore the different ways of representing combined probability situations diagrammatically, introducing tree diagrams as a way of finding the probabilities of combined events.

A separate lesson covers the language associated with conditional probability.

This unit of work is just one of several approaches that you could take when teaching this topic and you should aim to adapt the resources to match ability level of your learners as well as your school context.