Solving exercises on pages 72 and 73 of Math 3 Volume 2 textbook, Creative Horizon

Solving Math for grade 3 pages 72, 73 of SGK textbook, Creative Horizon volume 2
 

Solving exercises on pages 72 and 73 of Math 3 Volume 2 textbook, Creative Horizon:

Rectangle Area

Practice

1. Solve Exercise 1 Page 72 Math Textbook Grade 3

Problem: Draw and color the rectangles according to the model.

b) Calculate the area of each rectangle.

Solution Guide:
a) Draw according to the model.
b) Each square has an area of 1 cm², count how many squares each shape covers.
Then calculate the area of each rectangle.

Answers:
a) Students draw the shape themselves according to the model.
b) The area of the rectangle on the right is 6 cm².
The area of the rectangle on the left is 12 cm².

Practice Exercises

1. Solve Exercise 1 Page 73 Math Textbook Grade 3

Problem: Number ?

Solution Guide:
Area of rectangle = length x width (in the same unit of measurement).
Width of rectangle = Area of rectangle : length.

Answers:

2. Solve Exercise 2 Page 73 Math Textbook Grade 3

Problem: Calculate (according to the model).

Solution Guide: Based on the formulas for perimeter and area of a rectangle to calculate according to the model.

Answers:

3. Solve Exercise 3 Page 73 Math Textbook Grade 3

Problem: Observe the rectangular picture below and perform the task.

a) Number ?

b) Calculate.
Area of the picture.
Perimeter of the picture.

Solution Guide:
a) Estimate the length and width of the picture. Use a ruler to verify and fill in the measurements in the table.
b) Use the measurements to calculate:
+ Area of the picture = length x width (in the same unit of measurement).
+ Perimeter of the picture = (length + width) x 2.

Answers:

The solutions provided in this Math 3 Volume 2 textbook, Creative Horizon, are very detailed. Hopefully, students can do the exercises and reinforce their knowledge of Rectangle Area lesson.