# 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:

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
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