**Writing Probabilities**

Starter

Writing Probabilities

How many boys in the room?

What is the probability of a student selected at random being a boy?

Example

In a particular football team of eleven there are 4 left-footed players.

What is the probability that a player selected at random is left-footed?

**L.O. - To write probabilities using fractions.**

Start on the left, work your way across doing the calculations in your head, and write down the answer.

START ANSWER

55 >> +9 , ÷8 , x7 , -14 , ÷3 , ÷2 , square , +11 , ÷4 ………….

14 >> +16 , x2 , +3 , ÷9 , -5 , square , square , +20 , ÷4 ………….

27 >> ÷9 , square , x6 , -40 , x2 , +8 , ÷6 , +19 , ÷5 ………….

10 >> square , ÷4 , ÷5 , +3 , square , -10 , ÷6 , +4 , x2 ………….

70 >> ÷2 , +5 , ÷5 , +4 , x5 , ÷10 , square , +12 , ÷8 ………….

Main Activity

Bingo

Enter any of the fractions on the next screen

into your bingo grid. If they are the answer to

the probability question and you have them in

your grid then cross them off. Cross off all 9 and

BINGO!

Starter

Start on the left, work your way across doing the calculations in your head, and write down the answer.

START ANSWER

55 >> +9 , ÷8 , x7 , -14 , ÷3 , ÷2 , square , +11 , ÷4 …

15

.

14 >> +16 , x2 , +3 , ÷9 , -5 , square , square , +20 , ÷4 …

7

.

27 >> ÷9 , square , x6 , -40 , x2 , +8 , ÷6 , +19 , ÷5 …

5

.

10 >> square , ÷4 , ÷5 , +3 , square , -10 , ÷6 , +4 , x2 …

26

.

70 >> ÷2 , +5 , ÷5 , +4 , x5 , ÷10 , square , +12 , ÷8 …

6

.

Complete the Writing Probability Sheet

Main Activity

Complete the Writing Probability Sheet

(b) (h)

(c) (i)

(d) (j)

(e) (k)

(f) (l)

(g)

2

8

3

8

3

8

1

8

3

8

3

8

6

8

1

8

2

8

1

8

5

8

(b)

(c)

(d)

(e)

(f)

2

3

4

1

8

2

8

1

8

0

8

3

8

There are three 3s

Example

In a particular football team of eleven there are 4 left-footed players.

What is the probability that a player selected at random is left-footed?

4

11

**Activities**

**Activity**

Answers

Answers

**Key**

Examples

Examples

**Worked**

Example

Example