1. The In’s & Outs of Probability
And how to make it fun

2. What’s on the menu today?
Simple Experiments
Relative Frequency vs Theoretical Frequency
Introduction to Tree Diagrams

3. But first, let’s warm up 
Q 2/25
√ =17
x 1x 8=9
► 1x 8=_
Math Drill
Question?25
◄ + ‒ x ÷ + ‒ x ÷ ►
SELECT & [ENTER]
COMPETITION!!
Don’t forget to come past our stand – fastest time wins a SHARP microwave!!
Drill Mode
Press
Answer the questions and press
If you accidently type in something wrong press

4. Class marks Press Type in what you are converting to, e.g. 100
×55=
68 3 4
Press
Type in what you are converting to, e.g. 100
Type in what you are converting from, e.g. 80
Type in first student’s mark
Then simply type in the next student’s mark and again

5. PRIME FACTORIZATION!!!!!! Press
96 =
25x3
Press
Type in the number you want to prime factorize.
Tada!! 

6. Simple Experiments Lets start with flipping a coin. Press
<RANDOM>
0:RAND 1:R-DICE
2:R-COIN 3:R-INT
Lets start with flipping a coin.
Press
Choose for Coin.
To flip the coin press

7. Probability Exercise With the coin And now with the dice.
R.DICE= 2.
With the coin
And now with the dice.
To get there press:

8. This is a great introduction to Relative Frequency and Theoretical Probability
We expect every one out of six (for the dice) or one out of two (for the coin)
This is obviously not the case.
Relative frequency is what actually happens in real life.
Theoretical probability is the expected probability according to a theory.

9. Let’s play a game or two 
Yes, in maths! Oh my goodness 

10. This is a great introduction to Tree Diagrams
Why does it take so much longer to win at the coin version of the game than it does to win at the dice game?
Which probability is bigger?
What is the chance of getting 2 in a row right with
The dice?
The coin?

11. And what about the lotto?
Pick any six numbers between 1 and 49

12. What are the odds of actually winning the lotto?
1 49 × 1 48 _
The chance of getting the first number right is: 1 49
Press
The chance of getting the next number right is now 1 48
So type in

13. The chance of getting the third number right is: 1 47 Press
1 49 × 1 48 × 1 47 × 1 46 _
The chance of getting the third number right is: 1 47
Press
The chance of getting the next number right is now 1 46
So type in

14. The chance of getting the fifth number right is: 1 45 Press
< 1 47 × × 1 45 × 1 44 _
The chance of getting the fifth number right is: 1 45
Press
The chance of getting the next number right is now 1 44
So type in

15. So what do you think the odds of winning the lotto are?
Take a wild guess before pressing the button. 

16. Thank you! Take a look at www.mathsatsharp.co.za
for lots of high school worksheets with memos, sample exam
papers and resources for Maths and Mathematical Literacy.

17. Or try www.e-classroom.co.za
For primary school and high school