Playing with Numbers (IMO Level 1 Mathematics Olympiad (SOF) Class 6): Questions 9  18 of 86
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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.  1860,2220 

b.  1969,2220 

c.  1940,2220 

d.  1970,2220 

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

a.  216 

b.  512 

c.  342 

d.  27 

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

a.  Odd 

b.  Composite 

c.  Prime 

d.  Even 

Question number: 12
» Playing with Numbers
Question
The smallest value of ‘x’ in the number 156 × 0 so that it is divisible by10 is:
Choices
Choice (4)  Response  

a.  2 

b.  1 

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.  7 

b.  9 

c.  11 

d.  3 

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.  23 

b.  54 

c.  36 

d.  42 

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

a.  0 

b.  2 

c.  1 

d. 


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

a.  49 

b.  68 

c.  56 

d.  48 

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) 

Question number: 18
» Playing with Numbers
Question
The HCF of two numbers is 54. If one number is 27 and another is 162, then the LCM is
Choices
Choice (4)  Response  

a.  81 

b.  51 

c.  85 

d.  31 
