| 1 |
Binary |
Modern |
2 |
0, 1 |
1011 (Binary) |
Fundamental in digital computing, electronic circuits |
| 2 |
Ternary |
Historical |
3 |
0, 1, 2 |
210 (Ternary) |
Historical and less common, not widely used in computing |
| 3 |
Quaternary |
Historical |
4 |
0, 1, 2, 3 |
32 (Quaternary) |
Ancient Mayans used a base-4 system in their calendar |
| 4 |
Octal |
Modern |
8 |
0, 1, 2, 3, 4, 5, 6, 7 |
765 (Octal) |
Early computers, Unix file permissions |
| 5 |
Decimal |
Modern |
10 |
0, 1, 2, 3, 4, 5, 6, 7, 8, 9 |
456 (Decimal) |
Everyday arithmetic, used universally |
| 6 |
Duodecimal |
Historical |
12 |
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B |
7A (Duodecimal) |
Historical, used in ancient cultures |
| 7 |
Hexadecimal |
Modern |
16 |
0-9, A-F |
1A3 (Hexadecimal) |
Memory addressing in computing, color representation |
| 8 |
Sexagesimal |
Historical |
60 |
0-9, A-Z, a-z |
2J (Sexagesimal) |
Time measurement, ancient Babylonian numeral system |
| 9 |
Roman Numerals |
Historical |
- |
I, V, X, L, C, D, M |
XIV (Roman) |
Ancient Rome, used for numbering, timekeeping, inscriptions |