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Guidance on solving exercises on page 57 Math 5 with solution methods
1. Solve Exercise 1 on page 57 Math 5
Problem:
Mental multiplication:
a) 1.4 x 10 b) 9.63 x 10
2.1 x 100 25.08 x 100
7.2 x 1000 5.32 x 1000
c) 5.328 x 10
4.061 x 100
0.894 x 1000
Solution Method:
To perform the multiplication of a decimal by 10, 100, 1000, ..., we simply need to shift the decimal point of the decimal number to the right by one, two, three,... digits.
Answer:
a) 1.4 x 10 = 14 b) 9.63 x 10 = 96.3
2.1 x 100 = 210 25.08 x 100 = 2508
7.2 x 1000 = 7200 5.32 x 1000 = 5320
c) 5,328 x 10 = 53.28
4,061 x 100 = 406.1
0,894 x 1000 = 894
2. Solve Exercise 2 on page 57 Math 5
Problem:
Write the following measurements in xantimeters:
10.4dm; 12.6m; 0.856m; 5.75dm.
Solution method:
Students need to pay attention to converting length units:
1 dm = 10 cm
1 m = 100 cm
=> Applying the above knowledge, students only need to take the given decimal number and multiply it by the corresponding factor of 10, 100 to find the correct result.
>>> Review the instructions on multiplying a decimal by 10, 100, 1000,... in the section Solve Exercise 1 on page 57 Math 5.
Answer:
+ 1dm = 10cm, so 10.4dm = 10cm x 10.4 = 104cm.
+ 1m = 100cm, so 12.6m = 100cm x 12.6 = 1260cm;
+ 1m = 100cm, so 0.856m = 100cm x 0.856 = 85.6cm;
+ 1dm = 10cm, so 5.75dm = 10cm x 5.75 = 57.5cm.
3. Solve Exercise 3 on page 57 Math 5
Exercise:
A plastic container holds 10 liters of gasoline. Knowing that one liter of gasoline weighs 0.8 kg, and the empty container weighs 1.3 kg. How much does the gasoline container weigh in kilograms?
Solution:
* Problem summary:
1 container: 10 liters of gasoline
Weight of 1 liter of gasoline: 0.8 kg
Weight of empty container: 1.3 kg
Total weight of the gasoline container: ? kg
* Solution approach:
- Find the weight of 10 liters of gasoline by multiplying the number of liters in the container by the weight of 1 liter of gasoline.
- Find the total weight of the gasoline container by adding the weight of 10 liters of gasoline (previously calculated) to the weight of the empty container.
Answer:
10 liters of gasoline weigh in kilograms:
0.8 x 10 = 8(kg)
The total weight of the gasoline container is:
8 + 1.3 = 9.3(kg)
Final answer: 9.3 kg.
Concise guide to solving exercises on page 57 Math 5
Solving Math 5 Exercises:
This section provides solutions to exercises on page 57 of the Math 5 textbook. Students can review previously solved exercises on page 56 or preview upcoming solutions on pages 58 and 59 to enhance their understanding of 5th-grade math.
Additionally, Exercise 37 in Math 5 is a crucial lesson in the 5th-grade math curriculum that students should pay special attention to.
In addition to the covered content, students can prepare and explore the solutions to exercises on pages 38 and 39 of Math 5 to grasp the concepts in the 5th-grade math curriculum.
