Solve exercises on page 16 of Mathematics Grade 7 Volume 1, Cánh Diều Book - Exercise 2: Addition, subtraction, multiplication, division of rational numbers providing step-by-step solutions for exercises 1, 2, 3... according to the lesson content to help students easily tackle Math and reinforce the related lessons on rational numbers operations.
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Solve Mathematics Grade 7 exercises on page 16 Cánh Diều Book Volume 1
Solve exercises on page 16 of Mathematics Grade 7 Volume 1, Cánh Diều Book:
Exercise 2. Addition, subtraction, multiplication, division of rational numbers
1. Solve Exercise 1 Page 16 Mathematics Grade 7 Textbook
Problem: Calculate.
Solution:
Convert all operations to addition and subtraction of fractions.
Apply the commutative and associative properties for quick calculation (if possible).
Answer:
2. Solve Exercise 2 Page 16 Mathematics Grade 7 Textbook
Problem: Calculate:
Guidance for Solution: Convert the operations to multiplication and division of fractions.
Answer:
3. Solve Exercise 3 Page 16 Mathematics Grade 7 Textbook
Problem: Calculate reasonably:
Guidance for Solution:
a) Apply the commutative and associative properties of addition.
b) Apply the distributive property of multiplication over addition: a.(b + c) = a.b + a.c.
Answer:
4. Solve Exercise 4 Page 16 Mathematics Grade 7 Textbook
Problem: Find x, given:
Guidance for Solution: Utilize the rules of transposition, changing sides, and sign reversal to find x.
Answer:
5. Solve Exercise 5 Page 16 Mathematics Grade 7 Textbook
Guidance for Solution:
- Calculate the interest amount = Principal amount x 6.5 : 100.
- Calculate the amount withdrawn.
- Calculate the remaining amount.
Answer:
The interest amount is: 60 * 6.5 : 100 = 3.9 (million dong)
The principal and interest amount for Mr. Nhi after 1 year are:
60 + 3.9 = 63.9 (million dong)
The remaining amount for Mr. Nhi in the bank is: 63.9 - 21.3 = 42.6 (million dong).
6. Solve Exercise 6 Page 16 Mathematics Grade 7 Textbook
Problem: Calculate the floor area of the house in the picture below (measurements on the picture are in meters):
Guidance for Solution: Divide the figure into two rectangles then calculate the sum of the areas of those two rectangles.
Answer:
Guidance: Calculate the actual distance from the electrical outlet to the water tap, according to the map: Distance on the map : scale. => Compare with the distance and draw a conclusion.
Answer:
According to the map, the actual distance from the electrical outlet to the water tap is:
Hopefully, with the solution provided in the exercise guide on page 16 of Math 7 Workbook, Cánh Diều Book, students can understand the method, compare it with their own work. To reinforce their knowledge, students can solve similar exercises online.
Next Exercise:
- Solve Math Problems on Pages 20 and 21 in Workbook 1, Cánh Diều Book - Exercise 3. Exponential calculations with natural number exponents of rational numbers
- Solve Math Problems on Pages 25 and 26 in Workbook 1, Cánh Diều Book - Exercise 4. Order of operations. Parentheses rules
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