Math Violympic - L4 - V4 2016-2017

Bài thi số 1: Sắp xếp
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Sắp xếp theo bảng bên dưới (từ trái qua phải, từ trên xuống dưới):
6 seconds
9 seconds
12 seconds
20 seconds

35 seconds
50 seconds
1 minute
65 seconds

73 seconds
75 seconds
85 seconds
2 minutes

123 seconds

hour

hour

hour


hour
33 minutes
35 minutes
43 minutes

1 hour
50 minutes and
hour
1 hour 18 minutes
1 hour and
hour

1 hour and
hour
3 hours
4 hours
4 hours and
hour


Bài thi số2: Đi tìm kho báu
1. 8 liters of oil is filled in the fisrt can; 6 liters of oil is filled in the second can. How many liters are there in each can if they are filled equally?









2. Convert:
century = … years.
3. Convert:
day = … hours.
4. Convert:
day = … hours.
5. Convert:
century = … years.
6. Convert:
day = … hours.
7. Convert: 2 hours = …….minutes.
8. Convert: 2kg = …………..g.
9. Convert: 5kg = …………g
10. How many 2 - digit numbers can you make by using 1; 0; 3; 4?









11. How many 2 - digit numbers can you make by using 1; 2; 3 and 4?









12. How many 3 - digit numbers can you make by using 1; 2; and 3?









13. Find the arithmetic mean of consecutive numbers from 1 to 7.



14. Find the arithmetic mean of consecutive numbers from 1 to 15.



15. Find the arithmetic mean of consecutive numbers from 1 to 99.



16. Find the arithmetic mean of consecutive numbers from 3 to 11.



17. Find the arithmetic mean of consecutive numbers from 5 to 17.



18. How many years are there in 4 centuries?



19. If A; B and C are odd numbers such that A < B < C and A + B + C = 23 then the possible greatest value of C is…









20. If a = 10; b = 12 and the average of a, b, c is 17 then c = …






21. If the average of m and 9 is 14. Then m = ...






22. If the average of three distinct numbers is 18 then the possible greatest value for one of these numbers is ...









23. The average of 51; 64 and y is 124. Then y = ...






24. The average of the natural numbers from 9 to 21 is...



25. If the average of y; y + 2 and y + 4 is 12. Then y = ...









26. There are 8 packs of cookies, each of them weighs 150g. There are also 4 packs of candies, each of them weighs 200g. How many kilograms of cookies and candies are there altogether?









27. There are 28, 27, 32 and 37 students in 4 classses 4A, 4B, 4C and 4D respectively. What is the average number of students in each class?









28. Write down the greatest even 3 - digit number……………………………..
29. Write down the greatest odd 3 - digit number………………………………..
Exam 3: Vượt chướng ngại vật
1. 56 + 87 = 87 + … The missing number is …………………
2. 98 + 72 = 72 + … The missing number is …………………..
3. A fish weighs 1kg700g, a hundle of average weighs 300g. How many kilograms do they weigh in total?









4. Every 2 jackets cost $30 and every 4 coats cost $40. Find the total cost of 8 such jackets and 16 such coats?









5. Find the value of a such that: 115 x 99 = 110 x 99 + 10 x 99 - a x 99.









6. Find the value of x such that: x - 3925 = 1527.









7. Find the value of x such that: x - 3925 = 1559.









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