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Guidelines for solving exercises on pages 58, 59 Math 5, including solving methods
1. Solving Exercise 1 on pages 58 and 59 of Math 5 textbook
Problem:
Solve the following:
a) 25.8 x 1.5 ; b) 16.25 x 6.7;
c) 0.24 x 4.7; d) 7.826 x 4.5;
Solution Method:
Students grasp the rule of multiplying decimal numbers by decimal numbers:
- Set up the multiplication as usual: Place the first factor on the top row; place the second factor underneath the first factor, ensuring that the digits of each row align vertically; the decimal points of the two factors do not necessarily have to align vertically; place the multiplication sign between the two factors to the left of the calculation
Answer:
2. Solving Exercise 2 on pages 58 and 59 of Math 5 textbook
Problem:
Calculate and compare the values of a x b and b x a:
Observation: Multiplication of decimal numbers has the commutative property:
When swapping the two factors of a product, the product remains the same: a x b = b x a
b) Write down the calculation results immediately:
4.34 x 3.6 = 15.624 9.04 x 16 = 144.64
3.6 x 4.34=... 16 x 9.04=...
Solution Method:
- The commutative property of multiplication is stated as follows: When swapping the two factors of a product, the product remains unchanged.
- Students apply this rule, substitute numbers into the expression a x b, carefully calculate, find the correct result, which is also the result of the expression b x a.
Answer:
a)
The value of a x b and b x a are always equal
b) According to the commutative property of multiplication, we immediately have:
4.34 x 3.6 = 15.624 9.04 x 16 = 144.64
3. Solving Exercise 3 on pages 58 and 59 of Math 5 textbook
Problem:
A rectangular garden has a length of 15.62 m and a width of 8.4 m. Calculate the perimeter and area of the garden.
Solution Method:
- Given quantities:
+ Length: 15.62 m
+ Width: 8.4 m
- Quantities to find: Perimeter and area of the rectangular garden.
- Procedure:
+ Apply the formula for calculating the perimeter of a rectangle: Add the length to the width, whatever the result is, multiply it by 2
+ Apply the formula for calculating the area of a rectangle: Multiply the length by the width, calculate to get the correct result.
>>> Review the rule of multiplying decimal numbers by decimal numbers Here.
Answer:
Concise Guide to Solving Exercises on pages 58,59 Math 5
Here is the solution to Exercise on pages 58 and 59 of Math 5 textbook in the math exercise solving section for 5th grade. Students can review the solution to Exercise on page 57 of Math 5 textbook previously solved or preview the solution to Exercise on page 62 of Math 5 textbook to improve their understanding of Math in 5th grade.
