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Solve SBT lesson 2 Circular fan chart (C5 Math 7 – Horizon)
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Solve problem 1 page 107 SBT Math 7 Creative horizon episode 1 – CTST
Draw a pie chart representing the data from the following statistical table:
Number of animals at Phong Phu farm 

Pet type 
Cow 
Pig 
Chicken 
Rabbit 
Quantity 
25 
500 
100 
100 
Detailed instructions for solving Lesson 1
Solution method
To draw a pie chart representing data from the above statistical table, we perform the following steps:
Step 1: Analyzing data
– Sum the numbers: 25 + 500 + 100 + 100 = 725.
– Calculate the percentage of each metric to the whole:
\(\dfrac{{25}}{{725}} \approx 3\% ;\dfrac{{500}}{{725}} \approx 69\% ;\dfrac{{100}}{{725}} \approx 14\% ;\dfrac{{100}}{{725}} \approx 14\% \)
Step 2: Show the data
– Name the chart: Percentage of animals raised at Phong Phu farm.
– Note the object names and percentages on the chart.
Cow: 3%; Pigs: 69%; Chicken: 14%; Rabbit: 14%.
Detailed explanation
We have the following chart:
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Solution 2 page 107 SBT Math 7 Creative horizon episode 1 – CTST
Use the information from the chart below to answer the questions.
a) What does the graph represent information about?
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b) How many objects are represented?
c) Percentage of each subject to the whole?
Detailed instructions for solving Lesson 2
Solution method
Look at the chart and answer the questions
Detailed explanation
a) Observing the chart, we see the chart is named: “Percentage of fruits favorite of 7A students”
Therefore, the chart shows information about the percentage of fruits that students in Grade 7A like.
b) Observing the chart, we see that there are 5 fan shapes representing 5 objects, which are 5 types of fruits: mango, orange, watermelon, strawberry, durian.
c) Percentage of each subject to the whole:
Mango: 20%, orange: 20%, watermelon: 40%, strawberry: 10% and durian: 10%.
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Solution 3 page 107 SBT Math 7 Creative horizon episode 1 – CTST
Let’s plot the data from the following statistics table into a chart:
Ratio of budget allocated to environmental protection projects of city A 

Project 
Budget rate 
Domestic waste treatment 
25% 
Plant more trees 
40% 
Dredging canals 
25% 
Build more parks 
ten% 
Chart
Detailed instructions for solving Lesson 3
Solution method
From the table we have:
The percentage of budget allocated for Domestic Waste Treatment is 25%, so we fill in 25% in the fan image representing for Domestic Waste Treatment.
Detailed explanation
Similarly, we can represent the data in the chart as shown below:
You can also represent data into a graph in the following way:
We have: 10% < 25% = 25% < 40%.
Therefore, the fanshaped representation of domestic waste treatment and the fanshaped representation of canal dredging show equal proportions; Fan image shows Building more parks shows the smallest scale and fan shape shows Planting more trees shows the largest scale.
So we fill in the corresponding proportions to represent the data.
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Solve problem 4 page 108 SBT Math 7 Creative horizon episode 1 – CTST
Let’s analyze the data represented on the following chart:
Detailed instructions for solving Lesson 4
Solution method
Observe the given chart and analyze
Detailed explanation
Analyzing the chart we find:
– The chart shows information about the behavior rating rate of students in grade 7C.
There are four types of conduct: good, good, average, and poor.
– The type of good conduct accounts for the highest percentage.
– Good, average, and poor grades have the same low rate
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Solve problem 5 pages 108 SBT Math 7 Creative horizon episode 1 – CTST
a) Analyze the data shown on the following chart:
b) Based on the analysis of the chart above, what kind of drinks should you buy at the 7th grade yearend party?
Detailed instructions for solving Lesson 5
Solution method
What does the graph represent information about?
+ How many objects are represented?
+ Who has the highest percentage?
+ Who has the lowest percentage?
+ Correlation of percentages between objects.
Detailed explanation
a) Analyzing the chart above, we find that:
– The chart shows information about the percentage of favorite drinks of 7th grade students.
– There are four types of drinks that students love: lemonade, orange juice, mineral water, and milk tea.
– Milk tea accounted for the highest percentage.
– Lemon juice, orange juice accounted for the lowest percentage.
b) Based on the analysis of the chart above, at the endofyear party in grade 7 should buy four types of water: lemonade, orange juice, mineral water, and milk tea. In which milk tea should be bought the most.
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