What is a Numbers? Various types of Numbers.

 Numbers 

        A number is a mathematical object represent Quantity or Count, measure. We have ten digits, namely 0,1,2,3,4,5,6,7,8,9 called Zero, one, two, three, four, five, six, seven, eight, nine respectively.
        A number is denoted by a group of digits called numeral.

Various Types of Numbers:

        a. Natural Numbers:  Counting numbers are called natural numbers.
                                           Thus 1,2,3,4,..... are all natural numbers.

        

        b. Whole Numbers:   All counting numbers and 0 form the set of whole numbers.

                                          Thus 0,1,2,3..... etc. are whole numbers. 
                                          Clearly, every natural number is whole number and 0 is a whole number which is not a natural number.

        c. Integers:    All counting numbers, zero and negatives of counting numbers form the set of integers.

                                            Thus , …-3,-2,-1,0,1,2,3...… are all integers.

                                             Set of positive numbers are 1,2,3,4,5,.....
                                             Set of negative numbers are -1,-2,-3,....
                                             Set of all non-negative numbers are 0,1,2,3,...….