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Guidance for solving Grade 3 Mathematics exercises on pages 75, 76, 77, 78 of Workbook, Connect Knowledge with Life series
Solving exercises on pages 75, 76, 77, 78 of Grade 3 Math Workbook Volume 1, Connect Knowledge with Life series:
Dividing two-digit numbers by single-digit numbers
Activity 1
1. Solve Exercise 1 Page 75 Math Grade 3 Workbook
Problem: Calculate.
Guidance for solution: Divide from left to right.
Answer:
2. Solve Exercise 2 Page 76 Math Grade 3 Workbook
Problem: Mental calculation (according to the model).
60 : 2 80 : 4
90 : 9 60 : 3
Guidance for solution: Observe the sample example then mentally calculate the division of multiples of ten by a number.
Answer:
+) 6 tens : 2 = 3 tens.
60 : 2 = 30
+) 8 tens : 4 = 2 tens.
80 : 4 = 20
+) 9 tens : 9 = 1 ten.
90 : 9 = 10
+) 6 tens : 3 = 2 tens.
60 : 3 = 20
3. Solve Exercise 3 Page 76 Math Grade 3 Workbook
Problem: Find the exponent.
Guidance for solution: To find the unknown exponent, we divide the product by the known exponent.
Answer:
Activity 2
1. Solve Exercise 1 Page 77 Math Grade 3 Workbook
Problem: Calculate.
Guidance for solution: Perform division step by step from left to right.
Answer:
- See more: Solutions for exercises on pages 79, 80 of Math Grade 3 Workbook Volume 1, Connect Knowledge with Life series
2. Solve Exercise 2 Page 77 Math Grade 3 Workbook
Problem: Mr. Hoa brings 75 chicken eggs to the market for sale. He distributes the eggs equally into 3 baskets. How many eggs are there in each basket?
Solution: Number of eggs in each basket = Number of eggs Mr. Hoa brings to the market : Number of baskets.
Answer:
Each basket contains the following number of eggs:
75 : 3 = 25 (eggs)
The answer is: 25 eggs.
3. Solve Exercise 3 Page 77 Math Grade 3 Workbook
Problem: Find the divisions with a remainder of 3:
Answer: Perform division and then conclude the divisions with a remainder of 3.
Answer:
So the divisions with a remainder of 3 are 53 : 5 and 73 : 7.
Practice
1. Solve Exercise 1 Page 78 Math Grade 3 Workbook
Problem:
Solution: Perform division step by step from left to right.
Answer:
2. Solve Exercise 2 Page 78 Math Grade 3 Workbook
Problem: Number?
In the image below, the cats have equal weights, so do the dogs and robots.
Solution:
- Step 1: Count the number of each type of animal in the picture.
- Step 2: Weight of each animal = Total weight of animals on the scale : Number of animals.
Answer:
Each cat weighs 12 : 4 = 3 (kg).
Each dog weighs 72 : 4 = 18 (kg).
Each robot weighs 45 : 3 = 15 (kg).
3. Solve Exercise 3 Page 78 Math Grade 3 Workbook
Problem: A class has 29 students. Each desk can only seat 2 students. How many desks are needed for the class?
Solution: Perform the division 29 : 2 to find the minimum number of desks needed for the class.
Answer:
We have 29 : 2 = 14 (remainder 1)
So if we arrange 14 desks with 2 seats each, there will be 1 student left.
Thus, the class needs at least 15 desks.
4. Solve Exercise 4 Page 78 Math Grade 3 Workbook
Problem: Find the dividend.
Solution: To find the dividend, we multiply the quotient by the divisor.
Answer:
? : 5 = 17
17 x 5 = 85. So the number to be found is 85.
? : 3 = 28
28 x 3 = 84. So the number to be found is 84.
? : 4 = 15
15 x 4 = 60. So the number to be found is 60.
Using the exercises solution from pages 75, 76, 77, 78 of the Math 3 Textbook, Knowledge Connection with Life, you must have already known how to solve the exercises. You can do similar exercises in the exercise book to reinforce your knowledge.
