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
NUMBERS SYSTEMS CHAPTER 2 Reviewed by SSC-IBPS on 12:55:00 Rating: 5

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