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Solving Math Grade 3 exercises on pages 90 and 91 of Cánh Diều Workbook Volume 2
Solving exercises on pages 90 and 91 of Math Grade 3 Workbook Volume 2, Cánh Diều book:
Focus Practice
1. Solve Exercise 1 Page 90 Math Textbook Grade 3
Problem: Calculate the perimeter and area of the following shapes:
Solution guide: a) To find the perimeter of a rectangle, add the length and width (in the same unit of measurement) and multiply by 2. To find the area of a rectangle, multiply the length by the width (in the same unit of measurement).
Answer: a) Perimeter of the rectangle: (8 + 6) x 2 = 28 (cm). Area of the rectangle: 8 x 6 = 48 (cm^2). b) Perimeter of the square: 6 x 4 = 24 (cm). Area of the square: 6 x 6 = 36 (cm^2)
2. Solve Exercise 2 Page 90 Math Textbook Grade 3
Problem: Find the appropriate measurements for each ? in the table below.
Solution guide: a) To find the perimeter of a rectangle, add the length and width (in the same unit of measurement) and multiply by 2. To find the area of a rectangle, multiply the length by the width (in the same unit of measurement). b) To find the perimeter of a square, multiply the length of one side by 4. To find the area of a square, square the length of one side.
Answer:
3. Solve Exercise 3 Page 90 Math Textbook Grade 3
Problem: Mai joins 10 square carpets with 40 cm sides to form a large rectangular carpet with a width of 80 cm. What is the perimeter of the carpet Mai joined in centimeters?
Solution guide: Step 1: Find the length of the carpet. The length of the carpet equals 5 times the side length of the square. Step 2: Calculate the perimeter of the carpet. To find the perimeter of the rectangle, we add the length and width (in the same unit of measurement) and multiply by 2.
Answer: Width of the large rectangular carpet equals the length of the side of 2 squares (because 80 = 40 x 2). Therefore, the length of the carpet of the large rectangle equals the length of 10 : 2 = 5 (squares). The length of the carpet of the large rectangle is: 40 x 5 = 200 (cm). The perimeter of the carpet Mai joined is: (200 + 80) x 2 = 560 (cm)
4. Solve Exercise 4 Page 91 Math Textbook Grade 3
Problem: Observe the floor plan of a beauty gym center below and answer the questions:
a) Which room has the largest area? b) Which room has the smallest area?
Solution guide: Count the number of squares in each room. Compare the number of squares and then answer the questions.
Answer: Observing the drawing, we see: The area of the yoga room consists of 18 squares. The area of the dance room consists of 12 squares. The area of the gym room consists of 8 squares. The area of the sauna room consists of 6 squares. a) The room with the largest area is the yoga room. b) The room with the smallest area is the sauna room.
5. Solve Exercise 5 Page 91 Math Textbook Grade 3
Problem: Does the puzzle piece in image A cover image B completely?
Solution guide: Count the number of squares in each image and draw a conclusion.
Answer: The area of image A consists of 22 squares. The area of image B consists of 18 squares. Therefore, the puzzle piece in image A is sufficient to cover image B.
Solving exercises on pages 90 and 91 of Math Grade 3 Workbook Volume 2, Cánh Diều book is very helpful for you. If you want to see more solutions, you can follow the Math 3 section on Mytour.
