IMO Mathematics Olympiad (SOF) Class 6: Questions 125  131 of 1049
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Question number: 125
Question
The number with which 96 is multiplied so that product remains the same is ________
Choices
Choice (4)  Response  

a. 


b.  1 

c.  0 

d.  96 

Question number: 126
Question
Multiplicative identity for a rational number is________
Choices
Choice (4)  Response  

a.  2 

b.  0 

c.  1 

d.  None of the above 

Question number: 127
Question
If are two whole numbers, then commutative law is applicable to subtraction if and only if
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 128
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: 129
Question
Which of the following statement is true if N, W and I are sets of Natural, Whole and Integer numbers respectively?
Choices
Choice (4)  Response  

a.  I ⊂ W ⊂ N 

b.  N ⊂ W ⊂ I 

c.  I ⊂ N ⊂ W 

d.  W ⊂ N ⊂ I 

Question number: 130
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: 131
Question
Observe the following patterns. Then find the sum of .
………………………………………………………. ……………………………………………………….
Choices
Choice (4)  Response  

a.  64 

b.  100 

c.  121 

d.  81 
