Solving exercises on pages 27, 28, 29 of Math 3 Workbook Volume 2, the book Connecting Knowledge with Life.

Solving Math problems for grade 3 on pages 27, 28, 29 of Workbook Volume 2.

Solving exercises on pages 27, 28, 29 of Math 3 Workbook Volume 2, the book Connecting Knowledge with Life:

Area of a shape. Square centimeter

Activity 1

1. Solve Exercise 1 Page 27 Math Grade 3

Problem: Compare the area of triangle ABC with the area of triangle ADC.

Guidance: Observe the illustration to answer the question.

Answer:
By observing the illustration, we can see that triangle ABC is entirely within triangle ADC. Therefore, the area of triangle ABC is smaller than the area of triangle ADC.

2. Solve Exercise 2 Page 27 Math Grade 3

Problem: Which animal figure below has a larger area?

Guidance: Count the number of squares in both figures and compare. The figure composed of more squares has a larger area.

Answer:
The elephant figure consists of 29 squares, while the fish figure consists of 28 squares.
Therefore, the area of the elephant figure is larger than the area of the fish figure.

3. Solve Exercise 3 Page 27 Math Grade 3

Problem: Compare the area of figure A with the area of figure B.

Guidance: Count the number of squares in both figures and compare. The figure composed of more squares has a larger area.

Answer:
Figures A and B both have an area equal to the area of 4 squares.
Therefore, the area of figure A is equal to the area of figure B.

Activity 2

1. Solve Exercise 1 Page 28 Math Grade 3

Problem: Complete the table below (following the example).

Guidance:
- Square centimeter is abbreviated as cm².
- Read the numbers and then read the unit of square centimeters.
234 cm²

Answer:

2. Solve Exercise 2 Page 29 Math Grade 3

Problem: Number?

a) The caterpillar figure consists of ? squares of 1 cm².
The area of the caterpillar figure is ? cm².
b) The giraffe figure consists of ? squares of 1 cm².
The area of the giraffe figure is ? cm².

Guidance: Observe the drawings, count the number of 1cm² squares in each figure, and determine the area of each figure.

Answer:
a) The caterpillar figure consists of 4 squares of 1 cm².
The area of the caterpillar figure is 4 cm².
b) The giraffe figure consists of 9 squares of 1 cm².
The area of the giraffe figure is 9 cm².

Practice

1. Solve Exercise 1 Page 29 Math Grade 3

Problem: Calculate (following the example).

Guidance: Perform calculations with the numbers and then add the unit square centimeters after the results.

Answer:
a) 37 cm² + 25 cm² = 62 cm²                                       b) 15 cm² x 4 = 60 cm²
50 cm² - 12 cm² = 38 cm²                                               56 cm² : 7 = 8 cm²

2. Solve Exercise 2 Page 29 Math Grade 3

Problem: The red kite wing has an area of 900 cm². The yellow kite wing has an area of 880 cm². How much larger is the area of the red kite wing than the yellow kite wing in square centimeters?

Guidance: To calculate how much larger the area of the red kite wing is than the yellow kite wing in square centimeters, subtract the area of the yellow kite wing from the area of the red kite wing.

Answer:
The difference in area between the red kite wing and the yellow kite wing in square centimeters is:
                      900 - 880 = 20 (cm²)
                                               Answer: 20 cm².

We hope that through the exercise solutions on pages 27, 28, 29 of Math 3 Workbook Volume 2, the book Connecting Knowledge with Life, students have confidently grasped the knowledge of the area of a shape, square centimeter, and effectively completed the exercises.