DE VIOLYMPIC TOAN ANH4 VONG 4 NAM 20162017

<span class='text_page_counter'>(1)</span>Bài thi số 1: Sắp xếp. Bài thi số 2: 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? 1 2. Convert: 5 century = … years.. 1 3. Convert: 4 day = … hours. 1 4. Convert: 3 day = … hours.. 1 5. Convert: 2 century = … years. 1 6. Convert: 2 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..

<span class='text_page_counter'>(2)</span> 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?.

<span class='text_page_counter'>(3)</span> 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.. 8. Find the value of y, if 58 < y < 62 and y is an even number.. 9. Jenny, Mary and Anna have a total 390 stamps. Jenny has 39 stamps more than Anna and Anna has 45 stamps more than Mary. How stamps does Jenny have?. 10. If a + b = 279, a < b and there are 13 odd numbers between a and b. Then the value of a is ....

<span class='text_page_counter'>(4)</span> 11. In this figure, MNPQ is a square. Each its side is 15cm long. MGHQ is a rectangle and its width is 12cm shorter than its length. The perimeter of the rectangle GNPH is ...cm.. 12. The 20th century starts in 1901. It ends in …. 13. The 21st century starts in 2001. It ends in …. 14. The average of all numbers that are smaller than 1000 is .... 15. The average of five consecutive numbers is 105. Find the greatest number?. 16. The average of five numbers is 20. The average of the five numbers is 16 when one of the numbers is changed to 4. What is the original value of the changed number?. 17. The average of four numbers is 25. The average of the four numbers is 23 when one of the numbers is changed to 6. What is the original value of the changed number?.

<span class='text_page_counter'>(5)</span> 18. The average of six numbers is 10. The average of the six numbers is 8 when one of the numbers is changed to 3. What is the original value of the changed number?. 19. The difference of 10999 and the least 3 - digit number is … 20. The difference of 10999 and the least 4 - digit number is … 21. The greatest 3 - digit number is ………. 22. The greatest 4 - digit number is ……… 23. The last digit of the product 2 x 4 x 6 x … x 78 is ... 24. The last digit of the product 3 x 5 x 7 x 9 x 11 is ... 25. The figure below is made up of 4 squares its perimeter is 40cm. What is the area of one square?.

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