Buzz
Solve Grade 3 Math problems on pages 104-108, the book Connecting Knowledge with Life.
Solving exercises on pages 104-108 in Grade 3 Math Workbook, connecting knowledge with life:
Numeric Expressions. Calculate the value of numeric expressions
Activity 1
1. Solve Exercise 1 Page 104 Math Grade 3 Textbook
Problem: Calculate the value of the expression (following the example).
Guidance: Perform calculations from left to right.
Answer:
a) 27 - 7 + 30 = 20 + 30
= 50
b) 60 + 50 - 20 = 110 - 20
= 90
c) 9 x 4 = 36
2. Solve Exercise 2 Page 105 Math Grade 3 Textbook
Problem: Choose a number as the value for each expression.
Guidance:
Step 1: Calculate the values of the expressions.
Step 2: Connect the value of each expression with the appropriate number.
Answer:
We have:
32 + 8 - 18 = 40 - 18 = 22
6 x 8 = 48
80 - 40 + 10 = 40 + 10 = 50
45 : 9 + 10 = 5 + 10 = 15
Connecting as follows:
Activity 2
1. Solve Exercise 1 Page 106 Math Grade 3 Textbook
Problem: Evaluate the expression (according to the template).
Solution Guide:
- In the expression, perform multiplication and division first; then perform addition and subtraction.
- If the expression only contains multiplication and division, perform them from left to right.
Answer:
a) 30 : 5 x 2 = 6 x 2
= 12
b) 24 + 5 x 6 = 24 + 30
= 54
c) 30 - 18 : 3 = 30 - 6
= 24
- See more: Solve exercises on page 109, 110 Textbook Math 3 Volume 1, the book Connect knowledge with life
2. Solve Exercise 2 Page 106 Textbook Math Grade 3
Problem: Choose the number as the value for each expression.
Solution Guide:
Step 1: Calculate the values of the expressions.
Step 2: Connect the value of each expression with the appropriate number.
Answer:
We have:
40 + 20 - 15 = 60 - 15 = 45
56 - 2 x 5 = 56 - 10 = 46
40 + 32 : 4 = 40 + 8 = 48
67 - 15 - 5 = 52 - 5 = 47
We connect as follows:
Activity 3
1. Solve Exercise 1 Page 107 Textbook Math Grade 3
Problem: Evaluate the expression (according to the template).
Solution Guide: If there are parentheses in the expression, perform the operations inside the parentheses first.
Answer:
a) 45 : (5 + 4) = 45 : 9
= 5
b) 8 x (11 - 6) = 8 x 5
= 40
c) 42 - (42 - 5) = 42 - 37
= 5
2. Solve Exercise 2 Page 108 Textbook Math Grade 3
Problem: Choose the number as the value for each expression.
Solution Guide: If there are parentheses in the expression, perform the operations inside the parentheses first.
Answer:
(15 + 5) : 5 = 20 : 5
= 4
32 - (25 + 4) = 32 - 29
= 3
16 + (40 - 16) = 16 + 24
= 40
40 : (11 - 3) = 40 : 8
= 5
We connect as follows:
Practice
1. Solve Exercise 1 Page 108 Textbook Math Grade 3
Problem: Which expression has the largest value? Which expression has the smallest value?
Solution Guide:
Step 1: Calculate the values of the expressions.
Step 2: Compare the values of the expressions and draw a conclusion.
Answer:
5 x (6 - 2) = 5 x 3
= 15
5 x 6 - 2 = 30 - 2
= 28
(16 + 24) : 4 = 40 : 4
= 10
16 + 24 : 4 = 16 + 6
= 22
So the expression with the largest value is 5 x 6 - 2.
The expression with the smallest value is (16 + 24) : 4.
2. Solve Exercise 2 Page 108 Textbook Math Grade 3
Problem: Mai has 4 boxes of colored pencils, and she gives 2 boxes to Mi. How many colored pencils does Mai have left? Knowing that each box has 10 colored pencils.
Solution Guide:
Step 1: Calculate the remaining number of colored pencil boxes for Mai.
Step 2: Calculate the remaining number of colored pencils for Mai.
Answer:
After giving to Mi, Mai has the remaining number of colored pencil boxes:
4 - 2 = 2 (boxes)
Mai has the remaining number of colored pencils:
10 x 2 = 20 (colored pencils)
Final answer: 20 colored pencils
3. Solve Exercise 3 Page 108 Textbook Math Grade 3
Problem: a) How many liters of fish sauce are in all three barrels?
b) Calculate the value of the expression:
123 + 80 + 20
207 + 64 + 36
Solution Guide: Group the numbers with a sum of hundreds and perform calculations within the parentheses first, then outside the parentheses.
Answer:
123 + 80 + 20 = 123 + (80 + 20)
= 123 + 100
= 223
207 + 64 + 36 = 207 + (64 + 36)
= 207 + 100
= 307
Hoping that with the detailed solutions on pages 104, 105, 106, 107, 108 Textbook Math 3 Volume 1, the book Connect knowledge with life, these have assisted you in completing the exercises of the lesson Numeric Expressions. Calculating the value of numeric expressions is easy.
