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Solve Grade 3 Math exercises on pages 82, 83, 84 of the book Horizon of Creativity Volume 2
Solve Math Grade 3 exercises on pages 82, 83, 84 of the book Horizon of Creativity:
Geometry and Measurement Review
1. Solve Exercise 1 Page 82 Math Grade 3 Workbook
Problem: Number ?
a) 1 m = .?. dm 1 km = .?. m
= .?. cm 1 dm = .?. cm
= .?. mm 1 cm = .?. mm
b) 1 kg = .?. g
1 l = .?. ml
c) 1 year = .?. months Months with 31 days are month .?.
1 week = .?. days Months with 30 days are month .?.
1 day = .?.hours Months with 28 or 29 days are month .?.
1 hour = .?. minutes
Solution Guide: Recall the knowledge learned about units of length, mass, milliliters, months - years,...to fill in the appropriate numbers in the blanks.
Answers:
a) 1 m = 10 dm 1 km = 1,000 m
= 100 cm 1 dm = 10 cm
= 1,000 mm 1 cm = 100 mm
b) 1 kg = 1,000 g
1 l = 1,000 ml
c) 1 year = 12 months Months with 31 days are months 1, 3, 5, 7, 8, 10, 12
1 week = 7 days Months with 30 days are months 4, 6, 9, 11.
1 day = 24 hours Months with 28 or 29 days are month 2.
1 hour = 60 minutes
2. Solve Exercise 2 Page 82 Math Grade 3 Workbook
Problem: Choose the correct answer.
Solution Guide:
Apply the knowledge:
1 m = 100 cm
1 kg = 1,000 g
1 day has 24 hours.
Answer:
3. Solving Problem 3 on Page 82 of Math Textbook for Grade 3
Problem statement: Which statement is correct, and which one is incorrect?
a) 18 cm2 is read as eighteen square centimeters.
b) Mai's container has 450 ml of water, Hiệp's container has 650 ml of water. Both containers have 1 liter of water.
c) The whole class has lunch at 10:40 a.m.
Tran finishes lunch at 10:55 a.m., Ngoc finishes lunch at 11:05 a.m. Tran finishes lunch before Ngoc by 10 minutes.
Solution:
a) Use the way of reading units 'cm2' to answer the question.
b) Calculate the total amount of water in both friends' containers, compare it with 1 liter, then conclude.
c) Determine the time interval from when Tran finishes eating to when Ngoc finishes eating, compare it with 10 minutes, then conclude.
Answer:
a) False. 18 cm2 is read as eighteen square centimeters.
b) False (because 450 ml + 650 ml = 1,100 ml; 1 liter = 1,000 ml).
c) True (because from 10:55 a.m. to 11:05 a.m. is 10 minutes. Therefore, Tran finishes lunch before Ngoc by 10 minutes).
4. Solving Problem 4 on Page 82 of Math Textbook for Grade 3
Problem statement: Which statement is correct, and which one is incorrect?
a) The midpoint of a line segment may not lie on the line segment itself.
b) In a circle, the length of the diameter is equal to half the length of the radius.
c) The sum of the length and width of a rectangle equals half the perimeter of that rectangle.
d) A square has 4 right angles and 4 equal sides.
Solution: Recall the learned knowledge about the midpoint of a line segment, circle, rectangle perimeter, and characteristics of a square to determine the correctness of each statement.
Answer:
a) False (The midpoint of a line segment must lie on the line segment itself.)
b) False (in a circle, the length of the radius equals half the length of the diameter.)
c) True.
d) True.
5. Solving Problem 5 on Page 83 of Math Textbook for Grade 3
Problem statement: Which figure, when combined with the red figure, forms a rectangle?
Solution: Observe the diagram, based on the characteristics of the rectangle to find the missing shape.
Answer:
Because a rectangle has two equal long sides and two equal short sides, the triangle to be found must have 1 side with a length of 3 squares, and 1 side with a length of 2 squares.
Therefore, figure C combined with the red figure forms a rectangle.
6. Solving Problem 6 on Page 83 of Math Textbook for Grade 3
Problem statement: Which figure, when combined with the yellow figure, forms a cube?
Solution: Observe the diagram, based on the characteristics of the cube to find the missing shape.
Answer:
Figure B combined with the yellow figure forms a cube.
7. Solving Problem 7 on Page 83 of Math Textbook for Grade 3
Problem statement: Describe according to the template.
Solution: Observe the clock hands on each clock, compare with the correct timepiece to describe according to the template.
Answer:
8. Solving Problem 8 on Page 83 of Math Textbook for Grade 3
Problem statement: Read the temperature.
This is the temperature during noon and night in a locality. Which temperature belongs to noon?
Solution:
Noon temperature will be higher than night temperature.
Read the temperature indicated on the two thermometers, compare and answer the question.
Answer:
The thermometer on the right shows 29°C, and the one on the left shows 36°C. Thus, the temperature of 36°C belongs to noon.
Challenge
Problem statement: Number?
Hong used 5 square pieces of paper with 1 cm side lengths to form shape A.
a) The area of shape A is: .?. cm².
b) The perimeter of shape A is: .?. cm.
Solution:
+ Each square has an area of 1 cm². Count the number of squares in shape A to determine the area of shape A.
+ Based on the side length of the square being 1 cm to calculate the perimeter of shape A.
Answer:
Each square has an area of 1 cm². Shape A is composed of 5 squares. Therefore, the area of shape A is 5 cm².
The perimeter of shape A is: 10 cm.
Enjoy Learning
a) In the following picture, which objects have the shapes of the studied solids?
b) Cube, rectangular prism, each solid has how many vertices, edges, faces?
Solution:
a) Observe the picture, identify the studied solids.
b) Recall the shapes of the cube, rectangular prism to answer the question.
Answer:
a)
b) Cube, rectangular prism, each solid has 8 vertices, 12 edges, 6 faces.
Solving exercises on pages 82, 83, 84 of Mathematics 3 Volume 2 textbook, Creative Horizon book has helped students tackle exercises 1, 2, 3... Reviewing geometry and measurement lessons. Students can do more related exercises to reinforce their knowledge.
