kungfu math p3 slide16 (bar graphs)pdf
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TRANSCRIPT
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• Solving problems using information presented in bar graphs.
What will we learn today?
Data Analysis Bar graphs
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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.
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Here’s some important points to note. Whenever you see a graph, remember to look at the headings and values.
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Stamps Collection
John May Su Ling Wee Lee Tom
headings
value
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Stamps Collection
John May Su Ling Wee Lee Tom
e.g. John has 3 stamps.
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How many stamps do May and Tom have altogether?
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How many stamps do May and Tom have altogether?
5 3
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How many stamps do May and Tom have altogether?
5 + 3 = 8
5 3
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We are going to learn about BAR GRAPH today.
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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.
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An example of Bar Graph
0 10 20 30 40
Alan
Benny
Chris
Dave
Number of marbles
Number of marbles
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Try this out!
0 2 4 6 8 10 12
Alan
Benny
Chris
Dave
Number of marbles
Number of marbles
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How many marbles does Chris have?
0 2 4 6 8 10 12
Alan
Benny
Chris
Dave
Number of marbles
Number of marbles
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How many marbles does Chris have?
0 2 4 6 8 10 12
Alan
Benny
Chris
Dave
Number of marbles
Number of marbles
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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
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Let’s increase the level of difficulty.
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Try this out!
0
10
20
30
40
50
60
70
80
90
100
Chinese English Science Math
Scores
Scores
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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
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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.
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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 = _____
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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.
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Are you ready to try out the questions?
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