Playing With Numbers (IMO Mathematics Olympiad Class 6): Questions 8  17 of 86
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Question number: 8
» Playing With Numbers
Question
Number of prime numbers from 20 to 70 are
Choices
Choice (4)  Response  

a.  11 

b.  9 

c.  16 

d.  13 

Question number: 9
» Playing With Numbers
Question
The two numbers nearest to 2000 which are exactly divisible by each of 2, 3, 4, 5 and 6 is
Choices
Choice (4)  Response  

a.  1970, 2220 

b.  1969, 2220 

c.  1860, 2220 

d.  1940, 2220 

Question number: 10
» Playing With Numbers
Question
Which of the following is not a perfect cube?
Choices
Choice (4)  Response  

a.  27 

b.  342 

c.  512 

d.  216 

Question number: 11
» Playing With Numbers
Question
The numbers which are multiplies of 2 are called________.
Choices
Choice (4)  Response  

a.  Even 

b.  Composite 

c.  Odd 

d.  Prime 

Question number: 12
» Playing With Numbers
Question
The smallest value of ‘x’ in the number 156x0 so that it is divisible by10 is:
Choices
Choice (4)  Response  

a.  1 

b.  2 

c.  0 

d.  All a. , b. and c. are correct 

Question number: 13
» Playing With Numbers
Question
is divisible by
Choices
Choice (4)  Response  

a.  3 

b.  11 

c.  7 

d.  9 

Question number: 14
» Playing With Numbers
Question
The least number which when increased by 6 is exactly divisible by 12, 24 and 48 is
Choices
Choice (4)  Response  

a.  42 

b.  23 

c.  54 

d.  36 

Question number: 15
» Playing With Numbers
Question
The reciprocal of the smallest prime is
Choices
Choice (4)  Response  

a.  1 

b.  2 

c. 


d.  0 

Question number: 16
» Playing With Numbers
Question
Which of the following is a perfect square?
Choices
Choice (4)  Response  

a.  68 

b.  56 

c.  48 

d.  49 

Question number: 17
» Playing With Numbers
Question
Which of the following is the pair of twin primes?
Choices
Choice (4)  Response  

a.  (5, 11) 

b.  (7, 11) 

c.  (17, 19) 

d.  (19, 23) 
