Solving Problem 2 on Page 45 Math 4

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Ngày cập nhật gần nhất: 15/4/2026

Solving Problem 2 on Page 45 Math 5: Associative Property of Addition, Total Amount Received in Three Savings Days:

Guidance for Solving Problem 2 on Page 45 Math 5

Problem:
The savings fund received 75,500,000 dong on the first day, 86,950,000 dong on the second day, and 14,500,000 dong on the third day. How much money did they receive altogether in the three savings days?

Solution Method:
* Observation:
- The problem states:
+ Received on the first day: 75,500,000 dong
+ Received on the second day: 86,950,000 dong
+ Received on the third day: 14,500,000 dong
- Problem requires: Calculate the total amount received in three savings days.
* Solution Approach:
- Approach 1: Perform one calculation: Add up all the amounts received in three savings days.
- Approach 2: It can be noticed that when adding the amount from the first day and the third day, the result is a rounded million, therefore, students can split it into two calculations.
=> Perform two calculations:
+ Calculation 1: Amount received on the first day + Amount received on the third day
+ Calculation 2: Result from Calculation 1 + Amount received on the second day.

Answer:
The amount received on the first and third days of the savings fund is:
75,500,000 + 14,500,000 = 90,000,000 (dong).
After three days, the savings fund received an amount of:
90,000,000 + 86,950,000 = 176,950,000 (dong).
Answer: 176,950,000 (dong).

Part solution for exercise 45 Math 5 consists of 3 exercises, after solving exercise 2 on page 45 Math 5, let's continue to view suggestions and methods for Solving Problem 1 on Page 45 Math 4 and Solving Problem 3 on Page 45 Math 4 to improve understanding of Grade 5 mathematics.

Frequently Asked Questions

What is the total amount received in three savings days?

The total amount received in three savings days is 176,950,000 dong, calculated by adding 75,500,000 dong from the first day, 86,950,000 dong from the second day, and 14,500,000 dong from the third day.

How can the associative property of addition be applied in this problem?

The associative property of addition allows for the grouping of numbers in different ways. In this case, adding the first and third day's amounts together before adding the second day simplifies the calculation.

What two approaches can be used to solve this math problem?

The first approach involves adding all three amounts together directly. The second approach splits the calculation into two parts for simplicity, first adding the first and third days, then adding the result to the second day's amount.

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