Chapter 1 Number Systems Notes Class 9
Class 9 Number Systems Notes download Class 9 Number Systems Notes Number Systems 1. Number: A number is a mathematical object which is used in counting and measuring. 2. Number system: A number system defines a set of values used to represent a quantity. 3. Natural numbers: A set of counting numbers is called the natural numbers. N = {1,2, 3, 4, 5,...} These are infinite in number. Here first natural number is 1 whereas there is no last natural number. 4. Whole numbers: A set of natural numbers including zero is called the whole numbers. W = {0, 1, 2, 3, 4, 5,...} Note: All na...