0Natural Numbers : Numbers 1,2,3,4,5,.....etc.,which are used for counting the objects are called natural numbers.
note(The number zero 0 is not a natural numbers)
WHOLE NUMBERS: All natural numbers together with 0(zero) are called whole numbers.thus,0,1,2,3,4,5,......,etc are whole numbers.
INTEGERS All naturals numbers and negative of natural numbers with zero make a set of integers e.g...,-4,-3,-2,-1,0,1,2,3,4,....
| Note 1,2,3,4,...are called positive integers -1,-2,-3,-4,...are called negative integers '0' is neither positive nor negative. |
PRIME NUMBERS A number greater than 1 which cannot be divided by any other number execpt 1 and itself,is called a prime number. e.g., 2,3,5,7,11,13,17 etc.
COMPOSITE NUMBERS Numbers greater than 1 which are not prime are called composite numbers. e.g.,4,6,8,9 are all composite numbers.
note 1 is neither prime nor composite
EVEN NUMBERS The numbers which are divisible by 2 are called even numbers.e.g.,2,4,6,8,10 etc.
ODD NUMBERS The numbers which are note divisible by 2 are called odd numbers. e.g,1,3,5,7,9 etc
PERFECT SQUARE NUMBERS The numbers whose square root can be determined ,are called perfect square numbers. e.g.,4,36,225,...etc.
RATIONAL NUMBERS A rational number can always be represented by a fraction of the from p/q,where p and q are integers and q is not equal to zero (q≠ 0).All integers and fractions are rational numbers.e.g.,2(=2/1),2/3,3/5,7/13 etc.
IRRATIONAL NUMBERS An irretional number can't be expressed in the form of p/q where q≠0.
√3,√2 which give only an approximate answer in the form of a fraction or decimal number.
