Vòng 1
1. If 
 then 
 = 11 2:The average of 5, 7, 9, 11, 13 is  9
3: Write > ; = ; <
  =  
4:If 
 = 121 then  
 = 322
5: Find the value of k if 
The result: k = 7
6: If 
 and 
 then 
 = 108
7: If A is 
 more than 
 then A = 76
8: Write the missing number: 
 - 2416649 = 

9: It took 
 boys 
 hours to clean a house. How many 
 boys are needed to clean the house in 
 hours? The result is: 9 - 3 = 6  boys.
10:Three years ago, Nora was half as old as Mary is now. If Mary is four years older than Nora then Mary is 14 years old now.
Vòng 2 1:Calculate:
 = 13 2:Type the missing number:95 ; 97 ; 99 ; 101 ; 103
3: If N - 25 = 116 then N = 141 4: Fill in the blank with > ; < ; =
 < 

5.If 
 then 
 =. . . 25. . . 6: The sum of two consecutive numbers is 
.The greater number is . .75 . .
7:If 
 ; 
 and the average of 
 is 
 then 
 =. . . 18. . .
8: Fill in the blank with > ; = ; < 2 hours 30 minutes < 230 minutes
9: 6 workers take 2 hours to collect eggs. If 2 workers are sick, the other workers need 3 hours to collect the eggs. 10:Fin the greatest 4-digit-number which is divisible by both 4 and 7. The result is 9996

Vòng 3 1:The average of 
 , 
 and 
 is 5  2:Calculate:3 x 3 + 8 : 4 = 11
3: If 
 = 
 then 
 = 57 4: Subtract:
 = 3000
5: If 
 is divisible by 
, then the remainder of 
 is 0
6: How many minutes are there in a day (
 hours)? There are 1440 minutes.
7: If 
 then 
 = 32 8: Ed earns 
 dollars / hours. He will earn 160 dollars in 
 hours.
9: If 
 then 
 = 1 
10: It rained five days in June. How many days did it not rain in this month? The result is 25 days.
Vòng 4 1:If the average of A and 6 is 10 then A = 14
2: Write the number: 
The result is: 5907
3: The average of 21 and 23 is 22 4: If 
 then 
 = 79
5: The sum of 25 and x is the smallest 3-digit-number. x = 3
6:There are 7 even numbers from 1 to 15. 7:If 
 ; 
 ; 
 then 
  = 20
8: Minh is 9 years old. If the average of Minh and his mother is 22, then his mother is 35 years old.
9: N is a 2-digit number. If N + 5 < 20 and N + 5 is divisible by 9 then N = 13
10:Minh and Nam have a total of 9 pencils. If Minh has 4 pencils more than Khoa, then Nam and Khoa have a total of 5  pencils
Vòng 5 1:Fill in the blank:2 hours 2 minutes = 122 minutes 2:Caculate: 
 = 
3:Write as numerals: Nine thousand eight hundred and three The result is 5803
4: Find 
 if 
The result is 700
5: If a square has one side`s length = 9 cm then its perimeter is 36 cm.
6: If 
 and 
 then 
 = 0
7: If this fraction expresses the colorless parts of the circle, then x = 6
                      

8:Find the smallest number in the sequence: 5067, 5760, 6705, 5076 The result is 5067
9: Calculate: 2002 x 2005 - 2002 - 2004 x 2001 = 2004
10:If half of the product of 8 and 9 is three times of N then N = 12
Vòng 6 1:Fill > , < , =:12 + 13 + 14 < 40 2: The sum of 115 and 541 is 656
3: If N = 103 then (N + 22) + N = 12 4:1500 cm = 15 m
5: If a = 12 ; b = 15 and c = 39 then the average of a, b, c is 22
6:The product of 25 and 12 has 3 digits. 7: 15 kg + 1307 g = 16307 g
8: If 25 < A < 28 and A is divisible by 13 then A = 26
9:If