Probability Game
Instructions
Look at the set of number cards you have been given.
Imagine if somebody picked one of these cards at random – for example, by
picking a card when blindfolded, or picking a card out of a bag.
What would be the probability of the following events?
Event
Probability
as a fraction
Probability as a
decimal
Probability as a
percentage
Picking a multiple of 3
Picking a number smaller than 12
Picking a three-digit number
Picking a number smaller than 50
Picking a multiple of 10
Picking a number larger than 120
Picking a multiple of 4
Picking a number larger than 7
Feb 2012. Kindly contributed by Matthew Tiller; Ealing, Hammersmith & West London College. Search for Matthew on www.skillsworkshop.org Functional Maths: L1 Use data to assess the likelihood of an outcome, L2 Use probability to assess the likelihood of an outcome. Numeracy: HD2/L1.2 Express the likelihood of an event using fractions, decimals and percentages with the probability scale of 0 to 1. Page 1 of 3 Probability Game
Sample answers
Look at the number cards you have been given.
1
12
2
15
4
20
5
100
10
125
11
150
Imagine if somebody picked one of these cards at random – for example, by picking a card when
blindfolded, or picking a card out of a bag.
Event
Picking a multiple of 3
Picking a number smaller than 12
Picking a three-digit number
Picking a number smaller than 50
Picking a multiple of 10
Picking a number larger than 120
Picking a multiple of 4
Picking a number larger than 7
Probability
as a fraction
3
= 1
12
6
12
3
12
9
12
4
12
2
12
4
12
8
12
=
=
=
=
=
=
=
4
1
2
1
4
3
4
1
3
1
6
1
3
2
3
Probability as a
decimal
0.25
Probability as a
percentage
25%
0.5
50%
0.25
25%
0.75
75%
0.3333 or 0.33
33.33% or 33%
0.1667 or 0.17
16.67% or 17%
0.3333 or 0.33
33.33% or 33%
0.6667 or 0.67
66.67% or 67%
Feb 2012. Kindly contributed by Matthew Tiller; Ealing, Hammersmith & West London College. Search for Matthew on www.skillsworkshop.org Functional Maths: L1 Use data to assess the likelihood of an outcome, L2 Use probability to assess the likelihood of an outcome. Numeracy: HD2/L1.2 Express the likelihood of an event using fractions, decimals and percentages with the probability scale of 0 to 1. Page 2 of 3 Probability game – number cards
1
12
1
12
1
12
1
12
2
15
2
15
2
15
2
15
4
20
4
20
4
20
4
20
5
100
5
100
5
100
5
100
10
125
10
125
10
125
10
125
11
150
11
150
11
150
11
150
Feb 2012. Kindly contributed by Matthew Tiller; Ealing, Hammersmith & West London College. Search for Matthew on www.skillsworkshop.org Functional Maths: L1 Use data to assess the likelihood of an outcome, L2 Use probability to assess the likelihood of an outcome. Numeracy: HD2/L1.2 Express the likelihood of an event using fractions, decimals and percentages with the probability scale of 0 to 1. Page 3 of 3