• Natural No. (N) – 1, 2, 3, 4, 5, …..
• Whole No. (w) – 0,1, 2, 3, 4, ……
• Even No. – Those numbers which is dividable by 2. eg:- 2, 4, 6, 8, ……
• Odd No. – Those numbers which are not dividable by 2 eg:- 1, 3, 5, 7,…….
• Prime No. – Those numbers which is dividable by 1 or itally. eg:- 2, 3, 5, 11, 13, ……
• Composite No. – Those numbers which have 1 or more factors other than 1. eg:- 4, 6, 8, 9, …..