Playing With Numbers (IMO Mathematics Olympiad (SOF) Class 6): Questions 1  8 of 86
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Question number: 1
» Playing With Numbers
Question
A number is always divisible by 90 if
Choices
Choice (4)  Response  

a.  It is divisible by both 9 and 10 

b.  It is divisible by both 5 and 18 

c.  It is divisible by both 2 and 45 

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

Question number: 2
» Playing With Numbers
Question
The prime number that is placed at fifth after prime number 7 is
Choices
Choice (4)  Response  

a.  23 

b.  29 

c.  19 

d.  27 

Question number: 3
» Playing With Numbers
Question
Observe the following patterns. Then find the sum of .
………………………………………………………. ……………………………………………………….
Choices
Choice (4)  Response  

a.  64 

b.  100 

c.  121 

d.  81 

Question number: 4
» Playing With Numbers
Question
The number (12,7) are
Choices
Choice (4)  Response  

a.  Coprime numbers 

b.  Prime numbers 

c.  Prime and coprime 

d.  None of the above 

Question number: 5
» Playing With Numbers
Question
1265 is divisible by
Choices
Choice (4)  Response  

a.  3 

b.  11 

c.  10 

d.  2 

Question number: 6
» Playing With Numbers
Question
There are 207 white balls and 115 blue balls. These balls are to be arranged in buckets containing the same number of balls. Then the greatest number of balls possible in each bucket is
Choices
Choice (4)  Response  

a.  217 

b.  18 

c.  28 

d.  23 

Question number: 7
» Playing With Numbers
Question
The number 6,43,590 is divisible by
Choices
Choice (4)  Response  

a.  2 

b.  6 

c.  3 

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

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 
