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Solving Math problems for grade 3 on pages 30 and 31 of Creative Horizon series Workbook Volume 2
Solving exercises on pages 30 and 31 of Math 3 Workbook Volume 2, from the Creative Horizon series
Dividing a four-digit number by a one-digit number
Practice
1. Solve Exercise 1 on Page 30 of Math Workbook Grade 3
Problem: Set up the calculation and then solve it.
Instruction: Set up the calculation and then perform division by sequentially dividing each digit of the dividend by the divisor from left to right.
Answer:
Practice
1. Solve Exercise 1 on Page 30 of Math Workbook Grade 3
Problem: Find the number.
Instruction:
+ To find the dividend, multiply the divisor by the quotient.
+ To find the divisor, divide the dividend by the quotient.
Answer:
2. Solve Exercise 2 on Page 30 of Math Workbook Grade 3
Problem: True or false? Correct the false statements to make them true.
Instruction: Use the method of setting up and performing division to determine the correctness of the statements.
Answer:
a) True.
b) True.
c) False.
Correction:
3. Solve Exercise 3 on Page 30 of Math Workbook Grade 3
Problem: Which statement is correct, which one is incorrect?
a) Each milk box weighs 432 g. So, 3 milk boxes weigh: 432 x 3 = 1,296 (g).
1,296 g = 1 kg 296 g.
Therefore, statement a) is correct.
b) Distribute 5,400 ml of honey evenly among 8 families. Each family gets more than 1 liter of honey.
Instruction:
a) The weight of 3 milk boxes = weight of 1 milk box x 3.
b) The amount of honey each family gets = 5,400 ml : 8.
Compare the results obtained to determine the correct and incorrect statements.
Answer:
a) Each milk box weighs 432 g. So, 3 milk boxes weigh: 432 x 3 = 1,296 (g).
1,296 g = 1 kg 296 g.
Therefore, statement a) is correct.
4. Solve Exercise 4 on Page 30 of Math Workbook Grade 3
Problem: Find the number.
Instruction: Perform the calculations according to the arrows and fill in the blanks with the results.
Answer:
- See more: Solve exercises on Page 32 of Math Workbook Grade 3, Creative Horizon Mathematics
5. Solve Exercise 5 on Page 30 of Math Workbook Grade 3
Problem: Miss Le cleans 6 rooms in 3 hours. How many minutes does it take Miss Le to clean 1 room, knowing that the time to clean each room is the same?
Instruction:
+ Apply the knowledge that 1 hour = 60 minutes to convert the time to clean 6 rooms into minutes.
+ The time to clean 1 room = time to clean 6 rooms ÷ 6.
Answer:
Convert: 3 hours = 180 minutes.
Miss Le takes minutes to clean 1 room:
180 ÷ 6 = 30 (minutes)
Answer: 30 minutes.
Challenge
Instruction: Based on the time from start to finish of reading a book, determine the time An and Binh spend reading. Compare and answer the question.
Answer:
Binh reads from 3:45 PM to 4:45 PM. Therefore, Binh reads for 1 hour.
An reads from 4:30 PM to 6:30 PM. Therefore, An reads for 2 hours.
So An spends more time reading than Binh.
Fun Learning:
Guide: Weight of the giraffe = weight of the elephant : 4
Answer:
The weight of the giraffe is:
5 000 : 4 = 1 250 (kg).
So we fill in the number 1 250.
Solving exercises on pages 30, 31 Math Workbook Grade 3 Volume 2, Creative Horizon series has detailed solutions to all exercises, hoping you can effectively reinforce your knowledge of dividing a four-digit number by a one-digit number.
