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Solution to Exercise 1 on Page 170 of Math 2 Textbook
Problem:
Mental Calculation:
30 + 50 = 70 - 50 = 300 + 200 =
20 + 40 = 40 + 40 = 600 - 400 =
90 - 30 = 60 - 10 = 500 + 300 =
80 - 70 = 50 + 40 = 700 - 400 =
Answer:
30 + 50 = 80 70 - 50 = 20 300 + 200 = 500
20 + 40 = 60 40 + 40 = 80 600 - 400 = 200
90 - 30 = 60 60 - 10 = 50 500 + 300 = 800
80 - 70 = 10 50 + 40 = 90 700 - 400 = 300
Solution to Exercise 2 on Page 170 of Math 2 Textbook
Problem:
Solution to Exercise 3 on Page 170 of Math 2 Textbook
Problem:
In an elementary school, there are 265 female students and 234 male students. How many students are there in total at the elementary school?
Answer:
The elementary school has a total of:
265 + 234 = 499 (students)
Answer: 499 students.
Solution to Exercise 4 on Page 170 of Math 2 Textbook
Problem:
The first tank can hold 865 liters of water, and the second tank can hold 200 liters less than the first tank. How many liters of water can the second tank hold?
Answer:
The volume of water in the second tank is:
865 - 200 = 665 (liters)
Answer: 665l
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