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,...….

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