Solving exercise on page 65 of Math 4 textbook

=> Refer to the detailed document on solving fourth-grade math here: solving math problems for fourth graders

Guide to solving exercises on page 65 Math 4, including solution methods

1. Solving Exercise 1 on page 65 Math 4 textbook

Solution Method:
- Review the instructions on how to write area measurements in the section Solving Exercise 2 on pages 63, 64 Math 4 textbook
- Reading area measurements:
+ Read like natural numbers: Analyze the numbers into classes, each class consisting of 3 rows, successively from right to left; read the numbers like reading three-digit numbers accompanied by the class name (except for the unit class, which does not need to be read).
+ After reading the number part, it is necessary to include how to read area measurement symbols. 

2. Solving Exercise 2 on page 65 Math 4 textbook

Solution Method:
- According to the area measurement unit table:
+ Each large unit is 100 times the adjacent smaller unit
+ Each small unit is 1/100 of the adjacent larger unit. 
- Students note the following knowledge:
1 m² = 100 dm² => 1 dm² = 1/100 m²
1 dm² = 100 cm² => 1 cm²= 1/100 dm²

3. Solving Exercise 3 on page 65 Math 5 textbook

Problem:
To tile the floor of a room, 200 square tiles with a side length of 30cm were used. Calculate the area of the room in square meters, knowing that the area of the mortar joints is negligible?

Solution Method:
- Step 1: Calculate the area of one square tile by multiplying the side length by itself
- Step 2: Calculate the area of the room by taking the area of one tile and multiplying it by the number of tiles needed to tile the floor of that room

Answer:
The area of one floor tile is:
30 x 30 = 900 (cm²)
The area of the room is:
900 x 200 = 180000(cm²)
180000cm² = 18m²
Final answer: 18m².

4. Solving Exercise 4 on page 65 Math 5 textbook

Solution Method:
- Step 1: Divide the given shape into smaller rectangles
- Step 2: Calculate the area of rectangle H1 by multiplying its length by corresponding width on the diagram
- Step 3: Calculate the area of rectangle H2 by multiplying its length by corresponding width on the diagram
- Step 4: Calculate the width of rectangle H3 by subtracting the width of H2 from the total width of the cardboard piece
- Step 5: Calculate the area of rectangle H3 by multiplying its length by corresponding width on the diagram
- Step 6: Calculate the area of the cardboard piece by adding the area of H1, H2, and H3.

Here is the solution to Exercise 65 Math 4 in the section of solving fourth-grade math exercises. Students can review the solutions to Exercise 63, 64 Math 4 that have been solved earlier, or preview the solutions to Exercise 66, 67 Math 4 to better understand fourth-grade math

Detailed content of the solution to Math 4 page 57 has been fully instructed for students to refer to and prepare for better practice in fourth-grade math.

In addition to the learned content, students can prepare and explore the material in the solution to Math 4 page 54 to grasp the concepts in the fourth-grade math curriculum.