NUMBERS SYSTEMS CHAPTER 2

NUMBERS
IN COMPETITIVE EXAMS NUMBERS ARE THE IMPORTANT PART OF THE EXAMS.
 Let us explain the each topic in detailed in number systems.


ADDITION:
                      
                      Is the process of finding out single number or fraction equal to two or more quantities taken together.
    
                     Example: 25+63=88,  14+52=66,------- etc.
SUBSTRACTION:
                
               Is the process of finding out the quantity left when a smaller quantity is reduced from larger quantity one.
           
                Example: 54-23=31, 24.5-12.5=12, ----­--etc.


Multification:
            
                 Signifies repeated addition.if a number is repeatedly added then that number is multiplicand. The number of times the addition is to be done is multiplier. The sum of repetition is product.
  
      Example: 54*20=1080 here 54=multiplicand 20=multiplier 1080 =product
                  
                    60*35=2100
                  
                    78*86=6708
DIVISION:
             
                    It is the reverse process of multiplication. We find often a given number is divisor is contained another number is dividend.
              
              The number of expressing this is called quotient. Over the product and the quotient is called remainder.

Example:
                38/6 here 38=dividend 6=divisor 6=quotient 2=remainder.

RULES OF SIGNS:
                       
                 The product of two terms with like signs is positive: the product of two terms unlike signs is negative.
               -a*-a=a;
               -a*a=-a;
               a*-a=-a;
               a*a=   a;  
PRIME NUMBERS :
                       
                 A prime number is a number which has factors only unity and it self.
             Example: 2,3,5,7,11,13,17,19,23,----------etc.

        Note: There are 25 prime numbers are there between 1 to 100 prime numbers.

COMPOSITE NUMBERS:

                           A number which has more then two different factors is called a composite numbers.
Example : 8,10,21,56,84,27,81,--------------etc.

TWIN PRIME NUMBERS:

                     Two prime numbers are said to be twin prime number to be primes difference between them is two.

   Example: (3,5),(5,7),(11,13),(41,43) ---------------etc.www.ssc-ibps.com
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