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Guidelines for solving exercises on page 45 of Math 4, including solution methods
1. Solving Exercise 1 on page 45 of Math 5 textbook
Problem:
Compute conveniently:
a) 3254 + 146 + 1698 b) 921 + 898 + 2079
4367 + 199 + 501 1255 + 436 + 145
4400 + 2148 + 252 467 + 999 + 9533
Solution Method:
- Step 1: Group the terms in the given expression into groups with sums of rounded tens/hundreds/thousands...
- Step 2: Perform addition as usual.
Answer:
a) 3254 + 146 + 1698 b) 921 + 898 + 2079
= (3254 + 146) + 1698 = (921 + 2079) + 898
= 3400 + 1698 = 3000 + 898
= 5098. = 3898.
2. Solving Exercise 2 on page 45 of Math 5 textbook
Problem:
A 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 the fund receive over all three 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 requirement: Calculate the total amount received over all three days.
* Solution Approach:
- Approach 1: Perform one calculation: Add up all the amounts received over all three days.
- Approach 2: It can be observed that when adding the amount received on the first and third days, 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 by the savings fund is:
75,500,000 + 14,500,000 = 90,000,000 (dong).
After three days, the savings fund received a total amount of:
90,000,000 + 86,950,000 = 176,950,000 (dong).
Answer: 176,950,000 (dong).
3. Solving Exercise 3 on page 45 of Math 4 textbook
Problem:
Fill in the blanks with appropriate numbers or letters:
a) a + 0 = ... + a = ...
b) 5 + a = ... + 5
c) (a + 28) + 2 = a + (28 +...) = a + ..
Solution Method:
Apply two basic properties of addition:
- Commutative property: When swapping the addends in a sum, the sum remains unchanged.
- Associative property: When adding a sum of two numbers with a third number, we can add the first number with the sum of the second and third numbers.
Answer:
The children apply the associative property of addition to fill in the blanks as follows:
a) a + 0 = 0+ a = a
b) 5 + a = a + 5
c) (a + 28) + 2 = a + (28 + 2) = a + 30.
Step-by-Step Guide to Solve Exercise on Page 45 Math 4 Concisely
Detailed explanation of solving exercises on pages 43, 44 Math 4 textbook has been provided for reference and preparation to enhance Math 4 revision.
Solving exercises on page 48 Math 4 textbook is an important lesson in the Math 4 curriculum that students need to pay special attention to.
Last time, students were guided to solve Math 4 exercises on pages 43, 44 - Expressions containing three variables. The commutative property of addition is applied when adding a sum of two numbers with a third number, we can add the first number with the sum of the second and third numbers. This is a basic knowledge content helping students understand better and know how to solve exercises on the Associative property of addition more easily. The solution system is updated in detail in the Math 4 solving guide with full useful knowledge along with specific and easy-to-understand solving instructions, hopefully helping the process of revision, reinforcing knowledge, and making exercises on page 45 Math 4 textbook easier and more effective. After this exercise, we will together explore how to solve Math 4 exercises on page 46 SGK - Practice, the Associative property of addition. Invite you to refer for more details to apply to your learning and problem-solving process to achieve the highest results.
Above is the Solution for Exercise on Page 45 Math 4 in the section of Math 4 exercise solutions. Students can review the Solution for Exercises on Pages 43, 44 Math 4 which has been solved previously or preview the Solution for Exercises on Page 46 Math 4 to improve their understanding of Math 4.
