hi everyone, today in this video we are going to talk
about number system basically number system
defines different types of numbers here we are
going to focus on three basic number
systems which are natural numbers, whole numbers 
and integers. Natural numbers are the numbers which
are used for counting. Say if I have to give
you numbers of currency notes in my
wallet or toys I have or pens i have I'll
be using natural numbers. now coming on
to whole numbers they are just 0 plus all
natural numbers then we have integers
integers are a bit difficult because
there is a concept of direction here as in we
have positive integers and negative
integers so what do you mean by positive
and negative integers. so negative integers are nothing but just the reverse of positive
integers. let's take an example of direction so if we say north is positive that means
south is negative so if someone walks in north
direction we say he walks plus two
kilometre and if someone walks in the south direction then we say he has walked in negative direction by
two kilometre and we will represent it by
minus two (-2) and the other one north
direction walking by +2 so that's how he
write in number line as well we reverse
positive side of number line to create
negative side of number line. We have minus
one (-1) just on the left of zero (0) and we see
that two (2) is towards the right of one (1) so we have -2
-2 towards the left off minus one (-1) same
goes with minus three and then we have
-4, -5 and -6 here
we can look at it. All the numbers like 1,2,3 are
natural numbers and then we have 0 plus
all natural numbers as whole numbers and then we
have whole (complete) number line which we call as
the set of integers - negative integers as well as positive integers
and 0. Thats it for today. Thank you for watching :)
