- The number system with base/radix 10 is known as decimal number system. Occasionally called denary. It is the standard system for denoting integer and non-integer numbers.
- 10 symbols/digit are used in it (0,1, 2, 3, 4, 5, 6,7,8 & 9) to represent a number.
- Decimal number system is positional number system, i.e. every position in a number has assigned some weight.
Example , (345.697)10 , It is an decimal number . - Decimal numbers are shown below,
| octal numbers | binary numbers | decimal equivalent |
| 0 | 0 0 0 | 0 |
| 1 | 0 0 1 | 1 |
| 2 | 0 1 0 | 2 |
| 3 | 0 1 1 | 3 |
| 4 | 1 0 0 | 4 |
| 5 | 1 0 1 | 5 |
| 6 | 1 1 0 | 6 |
| 7 | 1 1 1 | 7 |
| 1 0 | 001 000 | 8 |
| 1 1 | 001 001 | 9 |
| 1 2 | 001 010 | 10 |
| 1 3 | 001 011 | 11 |
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