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Explore more quality learning materials for Math 3:
- Check out the complete set of solutions for Grade 3 Math, part of Connect Knowledge with Life Series
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Solutions for Math 3 exercises on pages 24, 25, 26, 27
Solutions for Exercises on Pages 24-27 Math 3 Workbook Volume 1, Connect Knowledge with Life Series:
Concentration Practice
Practice 1
1. Solve Exercise 1 on Page 24 Math Grade 3 Textbook
Problem: a) The weights of each animal are given below. Write the names of the animals in order of weight from smallest to largest.
b) Write the numbers 356, 432, 728, 669 as the sum of hundreds, tens, and units (following the example).
Solution Guide:
a) Compare the weights of each animal and arrange them in order from smallest to largest.
b) Determine the hundreds, tens, and units of each number and write them according to the example.
Answer:
b) 356 = 300 + 50 + 6
432 = 400 + 30 + 2
728 = 700 + 20 + 8
669 = 600 + 60 + 9
2. Solve Exercise 2 on Page 24 SGK Mathematics Grade 3
Problem: Set up and calculate:
Solution Guide:
- Arrange the calculation so that the digits are aligned vertically.
- Add or subtract from right to left.
Answer:
3. Solve Exercise 3 on Page 25 SGK Mathematics Grade 3
Problem: Quang Trung Primary School has 563 students. Lê Lợi Primary School has 29 more students than Quang Trung Primary School. How many students does Lê Lợi Primary School have?
Solution Guide: The number of students at Lê Lợi School = Number of students at Quang Trung School + 29 students.
Answer:
Le Loi Primary School has the number of students:
563 + 29 = 592 (students)
Answer: 592 students.
4. Solve Exercise 4 on Page 25 SGK Mathematics Grade 3
Problem: The number is?
Solution Guide:
a) To find the unknown term, subtract the sum from the known term.
b) To find the number being subtracted, add to the difference the number to be subtracted.
To find the subtracted number, subtract the difference from the number being subtracted.
Answer:
5. Solve Exercise 5 on Page 25 SGK Mathematics Grade 3
Problem: The number is?
Solution Guide:
- Observing the picture, we see that the sum of two consecutive numbers equals the number in the middle of the row above.
- From there, we fill in the missing numbers in the blank cells.
Answer:
Practice 2
1. Solve Exercise 1 Page 25 Mathematics Book Grade 3
Problem: Find mentally:
a) 2 x 1 3 x 1
4 x 1 5 x 1
b) 2 : 1 3 : 1
4 : 1 5 : 1
Instructions:
- Any number multiplied by 1 equals the number itself.
- Any number divided by 1 equals the number itself.
Answer:
a) 2 x 1 = 2 3 x 1 = 3
4 x 1 = 4 5 x 1 = 5
b) 2 : 1 = 2 3 : 1 = 3
4 : 1 = 4 5 : 1 = 5
2. Solve Exercise 2 Page 25 Mathematics Book Grade 3
Problem: Calculate (according to the pattern).
1 x 3 1 x 4
1 x 6 1 x 5
Solution:
- Step 1: Write the multiplication as the sum of equal addends then calculate.
- Step 2: Write the multiplication with the result obtained.
Detailed Solution:
+) 1 x 3 = ?
1 x 3 = 1 + 1 + 1 = 3
1 x 3 = 3
+) 1 x 4 = ?
1 x 4 = 1 + 1 + 1 + 1 = 4
1 x 4 = 4
+) 1 x 6 = ?
1 x 6 = 1 + 1 + 1 + 1 + 1 + 1 = 6
1 x 6 = 6
+) 1 x 5 = ?
1 x 5 = 1 + 1 + 1 + 1 + 1 = 5
1 x 5 = 5
- See also: Solution for exercises on pages 29 and 30 of Math Grade 3 Workbook 1, the book connecting knowledge with life
3. Solve Exercise 3 on Page 26 of Math Grade 3 Workbook
Problem: Number?
Guidance: Mentally calculate and then write the appropriate result in the blank box.
Answer:
4. Solve Exercise 4 on Page 26 of Math Grade 3 Workbook
Problem: Number?
Guidance:
a) Mentally calculate and then fill in the appropriate numbers in the blanks.
b) We observe the rule: The product of two adjacent numbers equals the number in the middle and belongs to the top row. From there, we can fill in the missing numbers.
Answer:
Practice 3
1. Solve Exercise 1 Page 26 of Math Grade 3 Textbook
Problem: a) Calculate (according to the model).
b) Mentally calculate.
0 x 6 0 x 7 0 x 8 0 x 9
0 : 6 0 : 7 0 : 8 0 : 9
Solving method:
a) Step 1: Write the multiplication as the sum of equal addends, then calculate.
Step 2: Write the multiplication with the result just found.
b) 0 divided by any non-zero number equals 0.
Answer:
a) 0 multiplied by 3 equals 0.
b) 0 multiplied by 6, 7, 8, and 9 all equal 0.
2. Solve Exercise 2 on Page 27 of Math Grade 3 Textbook
Problem: Which two calculations below have the same result?
Guidance: Calculate mentally and match two calculations with the same result.
Answer:
3. Solve Exercise 3 on Page 27 of Math Grade 3 Textbook
Problem: Team One has 8 friends, each friend contributes 5 notebooks to help flood-affected areas. How many notebooks did Team One contribute?
Guidance: To find the number of notebooks Team One contributed, multiply the number of notebooks each friend contributed by the number of friends in Team One.
Answer:
Team One contributed the number of notebooks as
5 x 8 = 40 (notebooks)
Answer: 40 notebooks.
4. Solve Exercise 4 on Page 27 of Math Grade 3 Textbook
Problem: Calculate the length of the zigzag path ABCDE.
Guidance: The length of the zigzag path ABCDE = Length of a straight segment x 4
Answer:
The zigzag path ABCDE consists of 4 straight segments of equal length, each measuring 3 cm.
So, the length of the zigzag path ABCDE is:
3 x 4 = 12 (cm)
Answer: 12 cm.
5. Solve Exercise 5 on Page 27 of Math Grade 3 Textbook
Problem: Number?
Guidance: Calculate the result of the operation mentally according to the arrow direction, then write the appropriate number in the blank space.
Answer:
Solve exercises on pages 24, 25, 26, 27 of Math Grade 3 Textbook, hoping to be a useful resource for students, supporting homework and learning process.
