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Solving Grade 3 Mathematics on pages 81 and 82 of Cánh Diều Workbook Volume 2
Solving exercises on pages 81 and 82 of Math 3 Workbook Volume 2, Cánh Diều book:
Concentration Practice
1. Solve Exercise 1 Page 81 Math Grade 3 Textbook
Problem: Find the unknown elements in the following calculations:
Solution Guide:
a) To find a term, subtract it from the total.
b) To find the subtracted number, add it to the difference.
c) To find the subtractor, subtract the difference from the minuend.
d) To find a factor, divide the product by the other factor.
e) In a complete division, to find the divisor, multiply the quotient by the divisor.
Answer:
2. Solve Exercise 2 Page 81 Math Grade 3 Textbook
Problem: Calculate the result of the following subtractions and then verify using addition:
Solution Guide:
+ Perform the subtraction.
+ Verify by adding the difference to the subtracted number.
Step-by-step solution:
+ To calculate the remaining kilograms of peaches in the basket, subtract the kilograms of peaches in the other basket from the total kilograms of peaches in both baskets.
+ To determine the remaining liters of water in the jug, subtract the liters of water in the other jug from the total liters of water in both jugs.
Answer:
4. Solve Exercise 4 Page 82 Math Book Grade 3
Problem: There are 1,690 crates of goods that need to be transported to supermarkets. So far, 4 shipments have been delivered, each containing 218 crates. How many crates are still waiting to be transported?
Solution Guide:
Step 1: Calculate the number of crates already transported = Number of crates per shipment x Number of shipments.
Step 2: Calculate the number of crates yet to be transported = Total number of crates for supermarkets - Number of crates already transported.
Answer:
All crates transported are:
218 x 4 = 872 (crates)
The number of crates yet to be transported is:
1,690 - 872 = 818 (crates)
Answer: 818 crates.
- See more: Solve exercises on pages 83 and 84 of Math Book 3 Volume 2, Cánh Diều textbook
5. Solve Exercise 5 Page 82 Math Book Grade 3
Problem: a) Write a division problem, for example: 246 ÷ 2 = ?
Calculate the quotient and use multiplication to check the result.
b) Calculate the results of the following divisions and use multiplication to verify:
59,190 ÷ 3
70,826 ÷ 7
Solution Guide:
a) Observe the example provided and perform the required steps.
b) Calculate the results of the given divisions and multiply the quotient by the divisor to cross-check.
c) Write another division problem (refer to the example provided), then calculate and verify the result.
Answer:
a) Students create their own examples.
b) We have:
6. Solve Exercise 6 Page 82 Math Book Grade 3
Problem: Đức challenges Linh: He spent 92,000 dong on 4 pens. How much is the cost of each pen? Help Linh answer this question and pose similar questions for your friend to solve.
Solution Guide:
+ The cost of each pen = total cost of 4 pens ÷ 4.
+ Pose similar questions and challenge your friend to solve.
Answer:
b) The cost of each pen is:
92,000 ÷ 4 = 23,000 (dong)
Answer: 23,000 dong.
c) Pose your own question.
With the detailed solutions provided in the exercise book pages 81 and 82 of Math Book 3 Volume 2, Cánh Diều textbook, it is hoped that students have strengthened their understanding, consolidated their knowledge, and effectively completed the exercises.
