Buzz
Solving 3rd-grade math problems on pages 113, 114, 115 of the book Connecting Knowledge with Life
Solving exercises on pages 113, 114, 115 of Math 3 Workbook Volume 1, the book Connecting Knowledge with Life:
Reviewing multiplication and division within the range of 100, 1000
Practice
1. Solve Exercise 1 Page 113 Math 3 Workbook
Exercise: Mental calculation.
Solution Guide:
Mental Calculation: 2 tens x 3 = 6 tens
20 x 3 = 60
We perform similar calculations for the remaining operations to find the results.
Answer:
a) 20 x 3 = 60 40 x 2 = 80 50 x 2 = 100 30 x 3 = 90
b) 60 : 2 = 30 80 : 4 = 20 90 : 3 = 30 100 : 5 = 20
2. Solve Exercise 2 Page 113 Math 3 Workbook
Exercise: Set up and calculate.
a) 34 x 2 15 x 6 23 x 4
b) 69 : 3 84 : 7 95 : 8
Solution Guide:
- Arrange vertically: Write the digits of each number in a column.
- Calculation:
+ For multiplication: Multiply digit by digit from right to left.
+ For division: Divide digit by digit from left to right.
Answer:
3. Solve Exercise 3 Page 113 Math 3 Workbook
Exercise: ??
Instruction: Check the calculation setup and results for each operation, if correct mark as C, if incorrect mark as I.
Answer:
a) Incorrect calculation, mark as I.
The correct calculation is:
b) Correct calculation, mark as C.
4. Solve Exercise 4 Page 113 Math 3 Workbook
Problem: Two cars are taking students to visit Ho Chi Minh Mausoleum, each car carries 45 students. How many students in total are visiting Ho Chi Minh Mausoleum?
Instruction: The number of students visiting the mausoleum = Number of students in one car x 2.
Answer:
The total number of students visiting Ho Chi Minh Mausoleum is:
45 x 2 = 90 (students)
Answer: 90 students.
5. Solve Exercise 5 Page 113 Math 3 Workbook
Problem: There are 28 liters of fish sauce in a container. How many 5-liter cans are needed to contain all of that fish sauce?
Instruction: The number of cans needed to contain all of the fish sauce = Number of liters of fish sauce in the container : 5.
Answer:
We have: 28 : 5 = 5 (remainder 3).
So, if we use 5 cans, there will be 3 liters remaining. Therefore, we need one more can to contain the remaining 3 liters of fish sauce.
Hence, at least 6 cans of 5 liters are needed.
Practice 2
1. Solve Exercise 1 on Page 114 of Math Grade 3 Textbook
Problem: Calculate mentally.
Instruction:
Mentally: 3 hundred x 3 = hundred
300 x 3 = 900
We perform similarly with the remaining calculations to find the results.
Answer:
a) 300 x 3 = 900 400 x 2 = 800 200 x 4 = 800 500 x 2 = 1000
b) 800 : 4 = 200 700 : 7 = 100 600 : 3 = 200 400 : 2 = 200
2. Solve Exercise 2 on Page 114 of Math Grade 3 Textbook
Problem: Set up and solve.
Instruction:
Step 1: Set up the calculation.
Step 2: Solve.
- For multiplication: Multiply from right to left.
- For division: Divide from left to right.
Answer:
3. Solve Exercise 3 on Page 114 of Math Grade 3 Textbook
Problem: Correct or Incorrect?
Instruction: Check the setup and calculation of each operation, mark D for correct and S for incorrect.
Answer:
a) Correct operation, mark D.
b) Incorrect operation, mark S.
The correct operation is:
4. Solve Exercise 4 on Page 114 of Math Grade 3 Textbook
Problem: You stack 256 cakes into boxes, with 8 cakes in each box. How many such cake boxes can you stack?
Instruction: The number of cake boxes you can stack = Total cakes : Cakes per box.
Answer:
You can stack the cake boxes as follows:
256 : 8 = 32 (cake boxes)
Answer: 32 cake boxes
5. Solving Exercise 5 Page 114 Math Book Grade 3
Problem: Find the suitable digit.
Solution Guide:
Step 1: Perform mental calculations based on the multiplication table learned.
Step 2: Fill in the number.
Answer:
- See also: Exercise Solution Page 116, 117 Math Book Grade 3 Volume 1, Connecting Knowledge with Life
Practice 3
1. Solve Exercise 1 Page 115 Math Book Grade 3
Choose the correct answers.
a) The product of 192 and 4 is:
A. 468 B. 768 C. 786 D. 867
b) The quotient of 906 divided by 3 is:
A. 320 B. 32 C. 203 D. 302
c) The remainder when 628 is divided by 8 is:
A. 2 B. 3 C. 4 D. 5
Solution Guide: Perform calculations and circle the appropriate answer.
Answer:
a) The result of multiplying 192 by 4 = 768. Choose B.
b) The result of dividing 906 by 3 = 302. Choose D.
c) 628 divided by 8 = 78 (remainder 4).
So, the remainder when 628 is divided by 8 is 4. Choose C.
2. Solve Exercise 2 Page 115 Math Book Grade 3
Problem: Find the unknown component in the arithmetic operation.
Solution Guide:
- To find the unknown factor, divide the product by the known factor.
- To find the dividend, multiply the quotient by the divisor.
- To find the divisor, divide the dividend by the quotient.
Answer:
3. Solve Exercise 3 Page 115 Math Book Grade 3
Problem: Mi picked 25 flowers, Mai picked three times as many as Mi did. How many flowers did they pick together?
Solution Guide:
Step 1: Find the number of flowers Mai picked = Number of flowers Mi picked x 3.
Step 2: Find the total number of flowers both sisters picked = Number of flowers Mi picked + Number of flowers Mai picked.
Answer:
The number of flowers Mai picked is:
25 x 3 = 75 (flowers)
The total number of flowers both sisters picked is:
25 + 75 = 100 (flowers)
Answer: 100 flowers
4. Solve Exercise 4 Page 115 Math Book Grade 3
Problem: The number?
Solution Guide:
Answer:
We counted a total of 15 stars in the picture.
We fill in as follows:
5. Solve Exercise 5 Page 115 Math Book Grade 3
Challenge!
Choose the digits 1, 2, 3 appropriately to replace the '?'
Solution Guide: Do mental calculation then fill in the appropriate number into the blank.
Answer:
We have 21 x 3 = 63
So, we fill in as follows:
Refer to the solution for exercises on pages 113, 114, 115 of Math 3 Textbook Volume 1, Connecting Knowledge with Life, hoping you have grasped the steps as well as the method of solving exercises on Reviewing Multiplication and Division within the range of 100, 1000.
