# Calculating probabilities

## Lesson details

### Key learning points

1. In this lesson, we will look at calculating probabilities and putting events in order of likelihood. We will then calculate probabilities using spinners and number cards.

### Licence

This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.

## Video

Share with pupils

## Worksheet

Share with pupils

## Starter quiz

Share with pupils

### 5 Questions

Q1.
There are 20 guests at a party. 12 of them are drinking coffee and the rest are drinking tea. What is the probability of selecting one who is drinking tea?
12/20
8
Cannot say.
Option 5
Q2.
There are 18 marbles in a bag. 13 of them are not green. What is the probability of selecting a green marble?
13/18
5%
Cannot say.
Q3.
The probability that it rains tomorrow is 0.4. What is the probability it is sunny?
0.4
0.6
40%
Correct answer: Cannot say.
Q4.
There are 100 cars in a car park. 40 of them are yellow. What is the probability of choosing a car that is not yellow?
40%
60
Cannot say.
Q5.
The probability that it will snow tomorrow is 0.05. What is the probability that it won't snow?
5
5%
95
Cannot say.

## Exit quiz

Share with pupils

### 5 Questions

Q1.
What is the probability that this fair spinner lands on an odd number?
0.3
1
3
Q2.
I roll a 10-sided dice. What is the probability I roll above a 5?
0.6
6
6%
Q3.
From the letters above, what is the probability of selecting a vowel?
Four to Seven
Correct answer: Four Elevenths
Four
Seven Elevenths
Q4.
I roll a 6-sided dice. What is the probability that I roll a number greater than 8?
0.2
0.8
1
Q5.
What is the probability that this fair spinner lands on a white triangle?
0
0.2