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In lesson 39, the knowledge system will focus on mental math problems, rules for dividing by 10, 100, 1 000... Apply the following method to Solve 4th Grade Math Problems, Pages 89-90, Kite Book 1, Dividing by 10, 100, 1 000,....
Refer to other resources for Solving 4th Grade Math:
Solving 4th Grade Math, Kite Book Series
Exercise 39: Dividing by 10, 100, 1 000,...
1. Solve Problem 1 - Grade 4 Kite Workbook Page 89
Problem Statement:
Mental Calculation:
Problem a)
Problem b)
Solution Method:
Apply the division rules for 10, 100, 1 000,...
Answer:
a) 8,000 ÷ 10 = 800
8,000 ÷ 100 = 80
8,000 ÷ 1,000 = 8
56,000 ÷ 10 = 5,600
56,000 ÷ 100 = 560
56,000 ÷ 1,000 = 56
6,400 ÷ 10 = 640
6,400 ÷ 100 = 64
64,000 ÷ 1,000 = 64
b) 130 ÷ 10 = 13
1,500 ÷ 10 = 150
2,300 ÷ 100 = 23
1,800 ÷ 100 = 18
21,000 ÷ 1,000 = 21
203,000 ÷ 1,000 = 203
Solve Problem 2 - Kite Grade 4 Workbook Page 89
Problem Statement:
Mental Calculation (following the model):
Solution Method:
Apply the rule of dividing by 10, 100, 1 000,... and follow the example
Answer:
a)
350 : 50 = ?
Mentally: 350 : 50 = 35 : 5 = 7
240 : 30 = ?
Mentally: 240 : 30 = 24 : 3 = 8
b)
2 400 : 60 = 240 : 6 = 40
6 300 : 70 = 630 : 7 = 90
3. Solve problem 3 - Kite Grade 4 Workbook Page 90
Problem statement:
To transport all bags of rice, each weighing 100 kg, a truck with a load capacity of 25 tons and a container truck with a load capacity of 60 tons were used. How many bags of rice can be loaded onto the truck at most, and how many bags of rice onto the container truck?
Solution:
The maximum number of bags of rice that can be loaded onto the truck = Load capacity of the truck : Weight of 1 bag
The maximum number of bags of rice that can be loaded onto the container truck = Load capacity of the container truck : Weight of 1 bag
Answer:
Conversion: 25 tons = 25,000 kg
Conversion: 60 tons = 60,000 kg
The maximum number of bags of rice that can be loaded onto the truck is:
250 (bags)
The maximum number of bags of rice that can be loaded onto the container truck is:
600 (bags)
4. Solve problem 4 - Cánh Diều Grade 4 Workbook Page 90
Write a division problem by 10, 100, 1,000,... For example, 4,500 ÷ 100 = ?
Challenge your friend to quickly mentally calculate the result.
a) Write a division problem by 10, 100, 1,000,... For example, 4,500 ÷ 100 = ?
Challenge your friend to mentally calculate the result quickly.
Switch roles with your friend and play.
b) Share with your friend how you quickly mentally calculate the division problems above.
Solution Method:
Apply the division rules for 10, 100, 1,000,...
Answers:
a)
362,000 divided by 1,000 equals 362
26,000 divided by 10 equals 2,600
b)
When dividing round numbers like tens, hundreds, thousands, ... by 10, 100, 1,000, you simply need to remove the same number of zeros from the dividend as there are in the divisor.
You are currently viewing the guide for Solving 4th Grade Math on pages 89-90 of Kite Book 1, Division by 10, 100, 1,000,..., exercise 39. For exercise 38, Division by a single-digit number, you can refer back to the guide on pages 87-88 of Kite Book 1, or preview the guide for exercise 40, Division by a two-digit number, on pages 91-92 of Kite Book 1 to gain a deeper understanding of the lesson.
Wishing you all success in your math studies.
