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Solve Grade 3 Math on pages 83, 84 of Connect Knowledge with Life Workbook 1.
Solving exercises on pages 83, 84 of Math 3 Workbook 1, Connect Knowledge with Life:
Concentrated Practice
Practice 1
Solve Exercise 1 Page 83 Math Grade 3 Workbook
Problem: Calculate mentally. a) 10 x 7 = 70 20 x 4 = 80 40 x 2 = 80 30 x 3 = 90 b) 60 : 2 = 30 90 : 3 = 30 70 : 7 = 10 40 : 2 = 20
Guide: Mentally calculate the results of the operations as follows: 1 ten x 7 = 7 tens. Write 10 x 7 = 70. 6 tens : 2 = 3 tens. Write 60 : 2 = 30.
Answer: a) 10 x 7 = 70 20 x 4 = 80. 40 x 2 = 80 30 x 3 = 90. b) 60 : 2 = 30 90 : 3 = 30. 70 : 7 = 10 40 : 2 = 20
Problem: Which bridge should each friend cross to reach the appropriate apple basket?
Instructions: Each friend needs to go across which bridge to get the suitable apple basket?
Instructions: Mentally perform the division by 2 (halving) or multiplication by 3 (tripling) to find the appropriate apple basket for each number on the board.
Answer: +) 32 : 2 = 16. So, the boy in the green shirt crosses bridge A to pick apple basket number 16. +) 24 : 2 = 12. So, the girl crosses bridge A to pick apple basket number 12. +) 27 x 3 = 81. So, the boy in the red shirt crosses bridge B to pick the apple basket labeled 81.
Problem: Robo used 35 meters of fabric to make worker uniforms. Each set of worker uniforms uses 3 meters of fabric. How many sets of worker uniforms can Robo make?
Problem: Mai made 27 greeting cards, and Robo made 3 times as many greeting cards as Mai did. How many greeting cards did Robo make?
Instructions: The number of greeting cards Robo made = The number of greeting cards Mai made x 3.
Answer: Robo made the following number of greeting cards: 27 x 3 = 81 (greeting cards). Answer: 81 greeting cards.
Problem: In the morning, the store sold 30 kilograms of rice. The amount of rice sold in the afternoon is equal to the morning amount reduced by half. How many kilograms of rice did the store sell in the afternoon?
Problem: In the morning, the store sold 30 kilograms of rice. The amount of rice sold in the afternoon is equal to half of the morning amount. How many kilograms of rice did the store sell in the afternoon?
Instructions: The number of kilograms of rice sold in the afternoon = Number of kilograms of rice sold in the morning ÷ 2
Answer: The store sold the following kilograms of rice in the afternoon: 30 ÷ 2 = 15 (kg). Answer: 15 kg.
Practice 2
1. Solve Exercise 1 Page 84 Math Grade 3 Workbook
Problem: Set up the calculation and then compute (following the example)
Solution: Set up the calculation and divide from left to right.
Answer:
2. Solve Exercise 2 Page 84 Math Grade 3 Workbook
Problem: Number?
Solution: To multiply a number by a certain number of times, we multiply the number by the times.
To divide a number by a certain number of times, we divide the number by the times.
Answer:
3. Solve Exercise 3 Page 84 Math Grade 3 Workbook
Problem: Robot used 35 meters of fabric to make worker uniforms. Each set of worker uniform uses 3 meters of fabric. How many sets of worker uniforms can Robot make at most and how many meters of fabric are left over?
Solution: Perform the division 35 : 3 to find the maximum number of sets of uniforms that can be made.
Answer:
We have 35 : 3 = 11 (remainder 2)
So, Robot can make at most 11 sets of uniforms and have 2 meters of fabric left over.
Answer: 11 sets of uniforms.
2 meters of fabric.
4. Solve Exercise 4 Page 84 Math Grade 3 Workbook
Problem: During the tree planting festival, Viet planted 5 trees. The number of trees Robot planted is 3 times the number of trees Viet planted. How many trees did both friends plant together?
Solution:
Step 1: Number of trees Robot planted = Number of trees Viet planted x 3.
Step 2: Number of trees both friends planted = Number of trees Viet planted + Number of trees Robot planted.
Answer:
The number of trees Robot planted is:
5 x 3 = 15 (trees)
The number of trees both friends planted is:
5 + 15 = 20 (trees)
Answer: 20 trees.
The exercises on pages 83 and 84 of Math Grade 3 Workbook, Connecting Knowledge with Life, are solved in great detail according to the corresponding lesson content in the book. Students, remember to refer to these solutions for studying and reinforcing different exercise types.
