Number System

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                     Number System

Natural Numbers - Counting numbers are called natural numbers. 
• The least natural number is 1. 
• There are infinitely many natural numbers. 

Whole Numbers - All natural numbers together with 0 form the collection of all whole numbers. 
• The least whole number is 0. 
• There are infinitely many whole numbers. 
• Every natural number is a whole number. 
• All whole numbers are not natural numbers, as 0 is a whole number which is not a natural number. 
Integers -  All natural numbers, 0 and negatives of natural numbers form the collection of all integers. 
• 0 is neither negative nor positive. 
• There are infinitely many integers. 
• Every natural number is an integer. 
• Every whole number is an integer. 

SSC previous year questions (Important) 
Q. 1. Which of the following fraction is the greatest?
2/3 , 5/6 , 11/15 , and 7/8

A). 7/8
B). 11/15
C).  5/6
D). 2/3
Q. 2. If a number is as much greater than 31 as it is less than 75, then the number is 

A) 106
B) 44
C) 74
D) 53
Q. 3.When a number is divided by 36, the remainder is 19. What will be the remainder when the number is divided by 12 ? 

A) 7
B) 5
C) 3 
D) 0
Q. 4. If 3/4 of a number is 7 more than 1/6 of the number, then 5/3 of the number is : 
A) 12
B) 20
C) 15
D) 18
Q. 5. The digit in unit's place of the product 81×82×83× .........×89 is 
A) 0
B) 2
C) 6
D) 8
Q. 6. The sum of all the natural numbers from 51 to 100 is 
A) 5050
B) 4275
C) 4025
D) 3775
Q. 7. The sum of all those prime numbers which are not greater than 17 is 
A) 59
B) 58
C) 41
D) 42
Q. 8. The product of two numbers is 120 and the sum of their squares is 289. The sum of the two numbers is :
A) 23
B) 7
C) 13
D) 169 
Q. 9.Mohan gets 3 marks for each correct sum and loses 2 marks for each wrong sum. He attempts 30 sums and obtains 40 marks. The number of sums solved correctly is :
A) 15
B) 20
C) 25
D) 10
Q. 10. In an exam the sum of the scores of A and B is 120, that of B and C is 130 and that of C and A is 140. Then the score of C is : 
A) 65
B) 75
C) 70
D) 60


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