Buzz
All exercises of Chapter V: 5.18, 5.19, 5.20, 5.21 in the textbook are guided and provided with detailed and specific solutions in Math solving for Grade 7, pages 108-109, Volume 1, Connect Knowledge Book, allowing students to reinforce Chapter V knowledge and solve exercises easily.
Refer to multiple study materials for Grade 7 Mathematics
- Math solving for Grade 7, Connect Knowledge Book
- Math solving for Grade 7, pages 109-110, Volume 1, Horizon of Creativity Book - Exercise at the end of Chapter 5
- Math solving for Grade 7, pages 34-36, Volume 2, Kite Book - Exercise at the end of Chapter 5
Math solving for Grade 7, pages 108-109, Volume 1, Connect Knowledge Book with real-life connections
Exercise at the end of Chapter V
1. Solve Exercise 5.18 Page 108 Textbook Mathematics Grade 7
Problem: A research group conducted a survey on the career aspirations of 7th-grade students in a province and obtained results as shown in Figures 5.37.
a) Create a statistical table about the career aspirations of male and female students.
b) List professions with a higher proportion of female students choosing than male students.
c) In a secondary school in this province, there are 250 7th-grade students, including 130 male students and 120 female students. Predict the number of students aspiring to become teachers.
Solution Guide:
a) Observe two charts and create a statistical table.
b) Analyze the table created in point a and answer the question.
c) To find a% of b, multiply a by b and then divide by 100.
Answer:
a) Statistical table about career aspirations of male and female students.
b) The profession with a higher proportion of female students choosing than male students is: teacher.
c) The number of female students aspiring to become teachers in that high school is:
120 x 42 : 100 = 50 (students).
The number of male students aspiring to become teachers in that high school is:
130 x 13 : 100 = 17 (students).
2. Solve Exercise 5.19 Page 108 Mathematics Textbook Grade 7
Question: Given two charts below:
a) What information does each chart provide?
Service sector contributes $117 billion.
Agricultural sector contributes $13.05 billion.
Industrial and construction sector contributes $130.5 billion.
3. Solve Problem 5.20 Page 109 Math Textbook Grade 7
Question: Line graph Figure 5.40 illustrates the population and projected population size of China and India until 2050.
Based on the graph above, predict:
a) In 2020, which country has a larger population, approximately by how many billion people?
b) Around which year will the populations of the two countries be equal?
c) Identify the population trends of each country in the past and in the future.
Solution:
Observe the chart and answer the questions
Answer:
4. Solving Exercise 5.21 Page 109 Math Textbook Grade 7
Problem: To represent data in the following situations, which type of chart will you choose?
a) Contribution ratios to GDP of various economic sectors in Vietnam;
b) Changes in the export price of rice from 2010 to present.
Solution:
Select appropriate chart type: Pie chart or bar chart.
Answer:
a) To represent the contribution ratios to GDP of various economic sectors in Vietnam, we use a pie chart.
b) To represent the variation in the export price of rice from 2010 to the present, we use a line graph.
Here is the solution guide for Grade 7 Math Problem on page 108, volume 1. Students can also refer to the solution guide on page 114 and review exercises on page 107 to reinforce their knowledge.
- Grade 7 Math Solution on page 8, volume 2 of Knowledge Connection - Exercise: Ratio
- Grade 7 Math Solution on page 107, volume 1 of Knowledge Connection - Concentrated exercises on pages 106, 107
