Post on 04-Dec-2014
description
• Solving problems using information presented in bar graphs.
What will we learn today?
Data Analysis Bar graphs
We have learnt how to read and study graphs in Primary Two. Now, we are going to use this knowledge to help us solve problems.
Here’s some important points to note. Whenever you see a graph, remember to look at the headings and values.
Stamps Collection
John May Su Ling Wee Lee Tom
headings
value
Stamps Collection
John May Su Ling Wee Lee Tom
e.g. John has 3 stamps.
How many stamps do May and Tom have altogether?
How many stamps do May and Tom have altogether?
5 3
How many stamps do May and Tom have altogether?
5 + 3 = 8
5 3
We are going to learn about BAR GRAPH today.
Bar Graphs
A Bar Graph (also called Bar Chart) is a graphical display of data using bars of different heights.
We can use the graph to help us tabulate scores or numbers.
An example of Bar Graph
0 10 20 30 40
Alan
Benny
Chris
Dave
Number of marbles
Number of marbles
Try this out!
0 2 4 6 8 10 12
Alan
Benny
Chris
Dave
Number of marbles
Number of marbles
How many marbles does Chris have?
0 2 4 6 8 10 12
Alan
Benny
Chris
Dave
Number of marbles
Number of marbles
How many marbles does Chris have?
0 2 4 6 8 10 12
Alan
Benny
Chris
Dave
Number of marbles
Number of marbles
How many marbles does Chris have?
0 2 4 6 8 10 12
Alan
Benny
Chris
Dave
Number of marbles
Number of marbles
Let’s read the indicated value.
7
Let’s increase the level of difficulty.
Try this out!
0
10
20
30
40
50
60
70
80
90
100
Chinese English Science Math
Scores
Scores
The graph shows Alice’s scores for CA2. She accidentally spilled some coffee. If she scores a total of 300 marks for all four subjects, how much did she score for Science?
0
10
20
30
40
50
60
70
80
90
100
Chinese English Science Math
Scores
Scores
The graph shows Alice’s scores for CA2. She accidentally spilled some coffee. If she scores a total of 300 marks for all four subjects, how much did she score for Science?
0
10
20
30
40
50
60
70
80
90
100
Chinese English Science Math
Scores
Scores
60
90 80
Let’s read the indicated value.
The graph shows Alice’s scores for CA2. She accidentally spilled some coffee. If she scores a total of 300 marks for all four subjects, how much did she score for Science?
0
10
20
30
40
50
60
70
80
90
100
Chinese English Science Math
Scores
Scores
60
90 80
300 – 60 – 90 – 80 = _____
The graph shows Alice’s scores for CA2. She accidentally spilled some coffee. If she scores a total of 300 marks for all four subjects, how much did she score for Science?
0
10
20
30
40
50
60
70
80
90
100
Chinese English Science Math
Scores
Scores
60
90 80
300 – 60 – 90 – 80 = 70
She scored 70 marks for Science.
Are you ready to try out the questions?
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