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Solve 3rd-grade Math on page 68 of the book Horizon of Creativity Volume 2
Solve exercises on page 68 of Math Textbook 3 Volume 2, the book Horizon of Creativity:
What can you achieve?
1. Solve Exercise 1 Page 68 Math Textbook Grade 3
Problem: Mentally calculate:
Solution Guide: Mentally calculate the result of multiplication/division with numbers in the thousands and tens of thousands.
Answer:
30,000 x 2 = 60,000 4,000 x 8 = 32,000 7,000 x 9 = 63,000
60,000 : 2 = 30,000 32,000 : 8 = 4,000 63,000 : 9 = 7,000
60,000 : 3 = 20,000 32,000 : 4 = 8,000 63,000 : 7 = 9,000
2. Solve Exercise 2 Page 68 Math Textbook Grade 3
Problem: Set up and solve.
Solution Guide:
Step 1: Set up the multiplication and division.
Step 2:
- For multiplication: Perform the calculation from right to left.
- For division: Perform step by step from left to right.
Answer:
3. Solve Exercise 3 Page 68 Math Textbook Grade 3
Problem: Find expressions with equal values.
Solution Guide: Calculate the values of the expressions to identify those with equal values.
Answer:
We have:
A. 120 : 4 = 30 B. 100 x 5 = 500
C. 2 x 100 = 200 D. 410 x 6 = 2,460
K. 200 : 1 = 200 L. 6 x 410 = 2,460
T. 5 x (60 + 40) = 5 x 100 = 500 M. 120 : 2 : 2 = 30
So the expressions with equal values are: A and M; B and T; D and L; C and K.
4. Solve Exercise 4 Page 68 Math Textbook Grade 3
Problem: Replace .?. with appropriate words or numbers.
Yen sleeps from 9 pm to 6 am the next day. Oanh sleeps from 9:30 pm to 6 am the next day. The sleeping time of Yen is .?. more than Oanh, which is .?. minutes.
Solution Guide: Compare the sleeping time of the two and fill in the blanks with suitable words or numbers.
Answer:
Yen sleeps from 9:00 PM to 6:00 AM the next day. Therefore, Yen's sleep duration is 9 hours.
Oanh sleeps from 9:30 PM to 6:00 AM the next day. Therefore, Oanh's sleep duration is 8 hours and 30 minutes.
So, Yen's sleep duration is 30 minutes longer than Oanh's.
5. Solve Exercise 5 Page 68 Math Textbook Grade 3
Problem: The number ?
Solution Guide: To multiply a number by a certain number of times, multiply the number by the number of times.
Answer:
- See more: Solve exercises on page 69 of Math Textbook 3 Volume 2, the book Horizon of Creativity
6. Solve Exercise 6 Page 68 Math Textbook Grade 3
Problem: Mr. Tu harvested 30,000 kg of potatoes, twice the amount Mr. Nam harvested. How many kilograms of potatoes did Mr. Tu and Mr. Nam harvest in total?
Solution: Calculate the kilograms of potatoes Mr. Nam harvested = kilograms of potatoes Mr. Tu harvested : 2.
Total kilograms of potatoes both Mr. Tu and Mr. Nam harvested = kilograms of potatoes Mr. Tu harvested + kilograms of potatoes Mr. Nam harvested.
Answer:
Mr. Nam harvested the kilograms of potatoes:
30,000 : 2 = 15,000 (kg)
Both Mr. Tu and Mr. Nam harvested a total of kilograms of potatoes:
30,000 + 15,000 = 45,000 (kg)
Answer: 45,000 kg of potatoes.
Solve exercises on page 66 of Math Textbook 3 Volume 2, the book Horizon of Creativity. This is an excellent study material for mastering Math. If students are struggling with problem-solving techniques, they can refer to this guide.
