MathematicsFactors and Multiples (NSTSE (National Science Talent Search Exam Unified Council) Class 5): Questions 1  9 of 84
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Question number: 1
» Mathematics » Factors and Multiples
Question
The L. C. M. of two numbers is 10 times their H. C. F. Find the numbers. (Model Test Paper)
Choices
Choice (4)  Response  

a. 


b.  16,15 

c.  24,480 

d.  24,240 

Question number: 2
» Mathematics » Factors and Multiples
Question
How is 30 written as the product of primes?
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 3
» Mathematics » Factors and Multiples
Question
How many hundreds are there in the sum of the factors of 200?
Choices
Choice (4)  Response  

a.  4 

b.  536 

c.  400 

d.  40 

Question number: 4
» Mathematics » Factors and Multiples
Question
Find the smallest whole number that is divisible by 15 and 20.
Choices
Choice (4)  Response  

a.  45 

b.  40 

c.  30 

d.  60 

Question number: 5
» Mathematics » Factors and Multiples
Question
Identify the correct statement.
Choices
Choice (4)  Response  

a.  The smallest factor of a number is the number itself. 

b.  The L C M of two coprimes is their product. 

c.  The largest factor of a number is 1. 

d.  The H C F of twin primes is their product. 

Question number: 6
» Mathematics » Factors and Multiples
Question
is a list of prime number in descending order. What is the value of ?
Choices
Choice (4)  Response  

a.  21 

b.  67 

c.  73 

d.  16 

Question number: 7
» Mathematics » Factors and Multiples
Question
How many twin primes are there between 30 and 50?
Choices
Choice (4)  Response  

a.  9 

b.  10 

c.  5 

d.  8 

Question number: 8
» Mathematics » Factors and Multiples
Question
Find the L. C. M. of
Choices
Choice (4)  Response  

a.  24 

b.  72 

c.  108 

d.  36 

Question number: 9
» Mathematics » Factors and Multiples
Question
Find two common multiples of 15 and 20.
Choices
Choice (4)  Response  

a.  60,120 

b.  20,60 

c.  15,30 

d.  75,120 
