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Numbers are categories in different types, such as –

1.The natural numbers are represented by N; Counting numbers are called natural numbers.Example - 1, 2, 3, 4, 5…

2.Real numbers are represented by R; a number which can place on a number line is called real numbers.

3. Integers are denoted by Z, both positive and negative numbers, includes zero are known as integers.Example - Positive integers : 1,2,3,4… and Negative integers : -1,-2,-3,…

4 Rational numbers are denoted by Q, numbers which can be represented in the form of p/q where q is not equal to zero.

Example - 1, 1/3, 0.4 and -6/7 etc.

5

Example - a, b, c etc.

Relations of numbers- different symbols like “=", ">", "<", etc. are used to compare mathematical expressions and numbers.

Example

·16>3

· 9<15

- 5 + [2 (4 – 2)]

= 5+ [2(2)]

= 5 + [4]

= 5 + 16

= 21

6 + (4 + 3)

= 6 + (7)

= 6 + 343

= 349