# Calculating probabilities

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## Lesson details

### Key learning points

- 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.

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### 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%

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.

### 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

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

2