IMO Level 1 Mathematics Olympiad (SOF) Class 6: Questions 228  235 of 1059
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Question number: 228
Question
Difference between the face value of 3 & 5 in 134,890 and 215,648 is
Choices
Choice (4)  Response  

a.  2 

b.  8 

c.  25,000 

d.  29,242 

Question number: 229
Question
The coprime numbers and also prime numbers from the following pairs, is
Choices
Choice (4)  Response  

a.  47 and 63 

b.  29 and 57 

c.  83 and 97 

d.  31 and 33 

Question number: 230
Question
The least number which when decreased by 7 is exactly divisible by 6,7, 21 and 42 is
Choices
Choice (4)  Response  

a.  35 

b.  53 

c.  49 

d.  36 

Question number: 231
Question
HCF of the two numbers =
Choices
Choice (4)  Response  

a.  Product of numbers × their LCM 

b.  Product of numbers + their LCM 

c.  Product of numbers  their LCM 

d.  Product of numbers ÷ their LCM 

Question number: 232
Question
Which of the following is the pair that is not twin primes?
Choices
Choice (4)  Response  

a.  (5,7) 

b.  (11,13) 

c.  (17,19) 

d.  (23,29) 

Question number: 233
Question
Product of two integer is If one of the integers is , then the other is
Choices
Choice (4)  Response  

a.  28 

b.  8 

c.  1 

d.  0 

Question number: 234
Question
The least number of square tiles that will be needed to pave a plot 225 m by 30 m is
Choices
Choice (4)  Response  

a.  25 tile 

b.  30 tiles 

c.  15 tiles 

d.  45 tiles 

Question number: 235
Question
The number (67,54) are
Choices
Choice (4)  Response  

a.  Coprime numbers 

b.  Prime numbers 

c.  prime and coprime 

d.  All of the above 
