Vở bài tập Toán lớp 3 Tập 2 trang 49, 50 Phép cộng trong phạm vi

Introduction

In this article, we will solve exercises from a math workbook for 3rd-grade students. These exercises focus on addition within the range of 100,000. By following the E-E-A-T (Expertise, Authority, Trustworthiness) and YMYL (Your Money or Your Life) principles, we aim to provide accurate and reliable solutions to these problems.

Exercise 1: Calculate

Let’s start with the first exercise on page 49 of the math workbook. To solve this exercise, we need to perform column addition from right to left.

+ 65372348
+    8885
---------

First, we add the ones place: 7 + 8 = 15. We write down 5 and carry over the 1.

Next, we add the tens place: 4 + 3 + 1 (carryover) = 8. We write down 8.

Then, we add the hundreds place: 3 + 8 = 11. We write down 1 and carry over the 1.

Finally, we add the thousands place: 6 + 2 + 1 (carryover) = 9. We write down 9.

Therefore, the sum of 65,537 + 2,348 is 88,885.

Let’s apply the same process to the remaining exercises.

Exercise 2: Set up and Calculate

Moving on to exercise 2 on page 49, we are given a series of addition problems. Let’s set up the calculations based on the given numbers and solve them.

25,638 + 41,546
16,187 + 5,806
 4,794 + 8,123
58,368 +   715

Feel free to solve these exercises by following the column addition method mentioned earlier.

Exercise 3: Mental Addition (according to the pattern)

For exercise 3 on page 49, we are required to mentally calculate the sums according to the given pattern.

   5,000 + 3,000
   4,000 + 70,000
   7,000 + 9,000
  62,000 + 38,000

Try solving these mentally and compare your answers with the solutions provided below:

   5,000 + 3,000 = 8,000
   4,000 + 70,000 = 74,000
   7,000 + 9,000 = 16,000
  62,000 + 38,000 = 100,000

Exercise 4: Who Calculated Correctly?

In exercise 4 on page 49, we are asked to determine who calculated correctly among two people, Khánh and An. Let’s analyze the solution step by step.

   36,358 + 42,910 = 79,268

After comparing the calculations, we conclude that Khánh’s calculation is correct, while An’s calculation is incorrect.

Exercise 5: Total Amount of Collected Waste Paper

Moving on to exercise 5 on page 50, we are presented with information regarding the amount of waste paper collected by two different schools. Let’s determine the total amount of waste paper collected by both schools.

School A (Lê Văn Tám): 2,672 kg
School B (Kim Đồng): 2,718 kg

To find the total amount, we simply need to add the values together:

2,672 + 2,718 = 5,390 kg

Therefore, the two schools collected a total of 5,390 kilograms of waste paper.

Exercise 6: Shortest Routes

In the final exercise on page 50, we are asked to help Lan find the shortest routes from her house to school and from her house to the museum. Let’s analyze the map and provide the solutions.

• Shortest route from Lan’s house to school:

  • Route 1: Lan’s house to school (via gas station)

  • Distance: 14,000 meters

  • Route 2: Lan’s house to school (via supermarket)

  • Distance: 4,090 meters

  Comparing the distances, we conclude that the shortest route from Lan’s house to school is via the supermarket.

• Shortest route from Lan’s house to the museum:

  • Route 1: Lan’s house to the museum (via swimming pool)

  • Distance: 9,633 meters

  • Route 2: Lan’s house to the museum (via gas station)

  • Distance: 7,000 meters

  Comparing the distances, we conclude that the shortest route from Lan’s house to the museum is via the gas station.

Conclusion

By solving these exercises, we have practiced and improved our addition skills within the range of 100,000. Remember to follow the column addition method and carefully analyze the given information. Keep up the good work in mastering math concepts! For more math solutions and detailed explanations, visit Kienthucykhoa.com.