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Step-by-step guide to solving exercises on page 40 of 5th-grade Math, including solution methods
1. Solve Exercise 1 on page 40 of the 5th-grade Math textbook
Problem:
Remove trailing zeros in the decimal part to simplify decimal numbers:
a) 7,800; 64,9000; 3,0400
b) 2001,300; 35,020; 100,0100
Solution Method:
Note: When removing trailing zeros in the decimal part of the original decimal number, we obtain a new decimal number equal to the original decimal number.
Answer:
a) 7,800 = 7.8
64,9000 = 64.9
3,0400 = 3.04
b) 2001,300 = 2001.3
35,020 = 35.02
100,0100 = 100.01
2. Guide to Solve Exercise 2 on page 40 of the 5th-grade Math textbook
Problem:
Add additional zeros to the right of the decimal part of the following decimal numbers so that their decimal parts have an equal number of digits (all have three digits):
a) 5,612; 17,2; 480,59
b) 24,5; 80,01; 14,678
Solution Method:
- Key point to remember: When adding zeros to the right of the decimal part of a decimal number, we obtain a new decimal number equal to the original decimal number.
- Application to exercise: Observe the given decimal numbers, if the decimal part (including 3 digits) is lacking digits, add the necessary number of zeros to make it complete.
Answer:
a) 5,612 = 5.612
17,2 = 17.200
480,59 = 480.590
b) 24.5 = 24.500
80.01 = 80.010
14.678 =14.678.
3. Solve Exercise 3 on page 40 of the 5th-grade Math textbook
Problem:
When writing the decimal number 0.100, Lan writes 0.100 =100/1000; Mỹ writes 0.100 =10/100; Hùng writes 0.100 =1/100. Who is correct, and who is wrong? Why?
Solution Method:
Students need to understand how to write a decimal number as a decimal fraction: The number of digits in the decimal part (to the right of the decimal point) of the given decimal number corresponds to how many zeros there are in the denominator when converted to a decimal fraction.
=> Apply the above knowledge to determine who wrote correctly and who wrote incorrectly.
Answer:
We have:
100/1000 = 0.1
10/100 = 0.1
1/100 = 0.01
But: 0.100 = 0.10 = 0.1
Therefore, Lan and Mỹ are correct, while Hùng is wrong.
Concise Guide to Solve Exercises on page 40 of 5th-grade Math textbook
In addition to the content above, students can explore solving exercises on pages 38 and 39 of the 5th-grade Math textbook, practicing to enhance their knowledge of Math 5.
Alongside the learned content, students can prepare and explore solving exercises in the 6th-grade Math textbook on pages 41 and 42 to grasp the concepts in the 6th-grade Math curriculum.
Above is the solution for exercises on page 40 of the 5th-grade Math textbook in the exercises solving section for 5th-grade math. Students can review the solution for exercises on page 38 of the 5th-grade Math textbook previously solved or preview the solution for exercises on page 42 of the 5th-grade Math textbook to improve their understanding of 5th-grade Math.
