# Calculating the probability of combined events

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## Lesson details

### Key learning points

1. In this lesson, we will look at how we can use area maps to calculate probabilities of combined events.

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## Video

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## Worksheet

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## Starter quiz

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### 5 Questions

Q1.
How many boys didn't do their homework?
13
14
22
Q2.
How many girls were there altogether?
14
29
8
Q3.
How many students were there altogether?
20
55
84
Q4.
What is the probability of randomly selecting a student who did their homework?
1/4
13/20
21/40
Q5.
Given that I select a girl, what is the probability that she didn't do her homework?
13/20
21/42
8/22

## Exit quiz

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### 5 Questions

Q1.
I roll a fair six-sided dice. What is the probability I roll a 4 or a 6?
1/6
3/6
4/6
Q2.
What is the probability that both land on 2?
1/3
2/9
4/9
Q3.
What is the probability that they land on the same number?
1/2
1/9
2/9
Q4.
What is the probability that they land on different numbers?
1
2/9
8/9
Q5.
What is the probability that their sum is greater than 3?
1