1. Probability How likely is an event to occur?
What are the chances of that happening??!!

2. Lesson objectives:
To understand the terms ‘equal chance’ and ‘outcome’ when thinking about probability.
To complete a maths investigation involving tossing a coin and rolling a dice!
- to test the ‘equal chance’ theory!

3. Mathematical Vocabulary
We can describe the probability or chance of an event happening by saying:
It is IMPOSSIBLE.
It is UNLIKELY.
It is LIKELY.
It is CERTAIN.

4. Some events have an equal chance of happening or not happening
Some events have an equal chance of happening or not happening. Can you think of any?

5. We discussed these:
If you toss a coin you have an equal chance of getting a head or a tail. Heads or tails are the ‘outcomes’.
If a baby is born it has an equal chance of being a boy or a girl. Boy or girl are the ‘outcomes’.
If you roll a dice you have an equal chance of getting the number 1, 2, 3, 4, 5 or 6! These scores are the ‘outcomes’.

6. Today’s task: We are going to carry out a maths investigation.
We are going to investigate whether we have an equal number of heads and tails when we toss a coin 30 times.
We will also investigate whether we get an equal number of 1s, 2s, 3s, 4, 5s and 6s when we roll a dice 30 times.
We will record our findings.

7. What do you think we will find out?
Perhaps we will have 15 heads and 15 tails when we toss our coin 30 times??
Perhaps we will have each number on the dice 5 times. (five scores of 1, five scores of 2 etc.)
It’s up to you to find out!!!!

8. Did we achieve out learning objectives today?
We understand what is meant by the terms ‘equal chance’ and ‘outcomes’.
We have carried out an investigation into ‘equal chance’.
We have recorded our findings.

9. Things to think about!
If we rolled 2 coins what possible outcomes could we get?
If we rolled more than 1 dice what possible outcomes could we get?
What would our chances of getting 2 heads or a 6 be like then?!!!