Number System (IMO Mathematics Olympiad Class 7): Questions 70  74 of 81
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Question number: 70
» Number System
Assertion (Ꭺ)
Rational numbers are always closed under division by only nonzero rational numbers
Reason (Ꭱ)
Division by zero is not defined for any rational numbers
Choices
Choice (4)  Response  

a.  Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ 

b.  Ꭺ is false but Ꭱ is true 

c.  Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ 

d.  Ꭺ is true but Ꭱ is false 

Question number: 71
» Number System
Question
Which of the following statement is true?
Choices
Choice (4)  Response  

a.  The product of a negative and a positive integer may be zero 

b.  The product of a positive and a negative integer is negative 

c.  For all nonzero integers a and b, is always greater than either a or b 

d.  None of the above 

Question number: 72
» Number System
Question
Which of the following statement is true?
Choices
Choice (4)  Response  

a.  The product of two negative integers is positive 

b.  For all nonzero integers a and b, is always greater than either a or b 

c.  The product of a negative and a positive integer may be zero 

d.  None of the above 

Question number: 73
» Number System
Question
Simplify
Choices
Choice (4)  Response  

a.  89 

b.  88 

c.  87 

d.  90 

Question number: 74
» Number System
Question
The difference of the sum of even numbers and sum of odd numbers between 10 and 20 is________.
Choices
Choice (4)  Response  

a.  14 

b.  15 

c.  13 

d.  16 
