1. Calculating Probabilities
If a set of events have an equal chance of occurring, it is possible to calculate probabilities.
For example, you can calculate the probability of rolling a 4 on a die because the 4 has the same chance of occurring as the other numbers.

2. Calculating Probabilities
If you can calculate probabilities, you can use this simple method:
The number of results you want
The number of possible results
The probability of an event happening =

3. Calculating Probabilities
If you can calculate probabilities, you can use this simple method:
1 side with the number 4
6 possible sides
The probability of rolling a 4 on a normal die =

4. Calculating Probabilities
If you can calculate probabilities, you can use this simple method: 1 6
The probability of rolling a 4 on a normal die =

5. Calculating Probabilities
Which of these statements are true about the word MATHEMATICAL?
The probability of picking a vowel is 50 % because a letter picked is either a vowel or it isn’t? ______
The probability of picking a vowel is 5
because there are 5 vowels out of
12 letters? ______

6. Calculating Probabilities
This spinner represents all of class 6B
How class 6b get to school
Decide which of these statements are true.
other
walk
bike
car
bus

7. Calculating Probabilities
The chance of landing on a person who said bike or car is the same as landing on a person who walks? _______
The chance of getting “bike” is the same as getting “car”? _____
other
walk
bike
car
bus

8. Calculating Probabilities
The chance of getting “car” is 1
2 ? ______
The chance of getting car is 25 % ? ______
other
walk
bike
car
bus