0Numbers
To start with the topic of maths, today we will study about Numbers.
Now, to start with maths - the first thing you must know is the numbers and category they fall in.
What is the number?
A number is a group of the digit. Digit being 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.
Types of numbers
1)Natural number - {1, 2, 3, 4, 5.......} is a natural number. It is denoted by 'N'.
2)The whole Number - {0, 1, 2, 3.....} Remember if we include 0 in the set of the number then we will get the whole number.
Note: 0 is an only whole number which is not a natural number.
3)Integers - {..... - 4, - 3, - 2, - 1, 0, 1, 2, 3, 4........} Ok, so in Integers negative numbers are also included.
Positive Integer = +1, +2, +3......
Negative Integer = - 1, - 2, - 3.....
Note: 0 is neither positive nor negative number.
4) Rational Number - It is represented in the form of p/q where p and q both are integers and q ≠ 0
E.g.: 4/2, - 5/3.
When we convert the Rational number into the decimal, it behaves differently.
Terminating Decimal: 1/2 can also be written be like 0.5. That is when we divide 1 by 2 it does end giving 0.5 as a quotient.
Non-Terminating Decimal: 1/3 can also be written as 0.3333... that is when we divide 1 by 3 it will have no end and 3 will be repeated again and again.
5) Real Number - All natural number, whole number, integers, rational and irrational numbers are the real number.
Even Number: All number that comes in the table of 2 or let say all number that is divisible by 2 is an even number. Eg: - 4, 2, - 8 etc.
Odd Number: All number that does not fall in the table of 2 or is not divisible by 2 is called an odd number. Eg: - 7, - 9, 3, 5 etc.
