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Solving Math problems in 3rd-grade, pages 47 and 48, from the Horizon of Creativity series
Solving exercises on pages 47 and 48 in Math 3 Volume 2 textbook, Horizon of Creativity series:
Skills Showcase
1. Solve Exercise 1, Page 47 Math 3 Textbook
Problem Statement: Set up and solve:
Solution Guide:
- Addition and subtraction: Arrange vertically, align numbers in the same column, add/subtract from right to left.
- Multiplication: Set up the multiplication, perform it from right to left.
- Division: Set up the division, perform it from left to right.
Answers:
2. Solve Exercise 2, Page 47 Math 3 Textbook
Problem Statement: Which statement is true, and which is false?
a) The perimeter of a rectangle is twice the sum of its length and width.
b) The perimeter of a square is twice the length of its side.
c) When a number is multiplied by 3, the result is 2,000.
d) If you decrease a number by 3 times, you get 2,000.
Solution Guide:
a) b) Recall how to calculate the perimeter of a rectangle and a square to answer the questions.
c) To increase a number by a certain factor, multiply the number by that factor.
d) To decrease a number by a certain factor, divide the number by that factor.
The correct answers are as follows:
a) True.
b) False (because the perimeter of the square is 4 times the length of its side).
c) False (because 2,000 x 3 = 6,000).
d) True.
3. Solve Exercise 3 on Page 47 of Math Textbook Grade 3
Problem: A table tennis table for children has the shape of a rectangle, with a length of 152 cm and a width of 71 cm. Calculate the perimeter of the table surface.
Solution: To find the perimeter of the rectangle, add the length and the width (in the same unit of measurement) and multiply by 2.
The answer is:
The perimeter of the table is:
(152 + 71) x 2 = 446 (cm)
Answer: 446 cm.
4. Solve Exercise 4 on Page 47 of Math Textbook Grade 3
Problem: Choose the appropriate answer.
Answer:
To solve: Observe the diagram to identify the edges of the fish breeding area, grass planting, and cattle farming.
Answer:
+ Perimeter of the fish pond: 120 m.
+ Perimeter of the grassy garden: 180 m.
+ Width of the chicken coop: 20 m.
Perimeter of the chicken coop: 160 m.
+ Total perimeter of the entire land: 240 m.
Thus: a) Perimeter of the fish pond: 120 m.
b) Perimeter of the grassy garden: 180 m.
c) Perimeter of the chicken coop: 160 m.
d) Perimeter of the entire land: 240 m.
- See more: Solving exercises on pages 51, 52 of Math 3 Book 2, the book Horizon of Creativity
6. Solve Exercise 6 on page 48 of the 3rd-grade Math textbook.
Puzzle: Examine the calendar sheet.
a) The number ?.
In the order from the beginning to the end of the month, the Saturdays of April 2023 are: .?. ; .?. ; .?. ; .?. ; .?.
b) Answer the following questions.
How many Sundays are there in April 2023?
What is the last Sunday's date?
On the 16th, which day of the week is it?
Solution Guide: Observe the April calendar sheet to answer the questions.
Answer:
a) In the order from the beginning to the end of the month, the Saturdays of April 2023 are: 1; 8; 15; 22; 29.
b) + April 2023 has 5 Sundays.
+ The last Sunday is on April 30th.
+ On the 16th, it is the third Sunday of the month.
Problem 7 Page 48 Math Textbook Grade 3
Question: Possible or impossible?
In the box, there are two cubes, one pink and one yellow (see the picture).
Without looking into the box, pick one cube.
a) .?. you will get a yellow cube.
b) .?. you will get a pink cube.
c) .?. you will get a red cube.
Solution Guide: Observe the colors of the cubes in the illustration and base your choice of phrases on the likelihood when picking a cube.
Answer:
a) It is possible to pick a yellow cube.
b) It is possible to pick a pink cube.
c) It is impossible to pick a red cube.
Solve exercises on pages 47 and 48 of Math Grade 3 Workbook Volume 2, this innovative Horizon book provides detailed solution guidance. Refer to it for easy exercise completion and effective knowledge reinforcement.
