The vigesimal or base 20 numeral system is based on twenty (in the same way in which the decimal numeral system is based on ten).
| hexadecimal (base 16) | 120 | 220 | 320 | 420 | 520 | 620 | 720 | 820 | 920 | a20 |
| binary (base 2) | 12 | 102 | 112 | 1002 | 1012 | 1102 | 1112 | 10002 | 10012 | 10102 |
In mathematics and digital electronics, a binary number is a number expressed in the binary numeral system or base-2 numeral system which represents numeric values using two different symbols: typically 0 (zero) and 1 (one). The base-2 system is a positional notation with a radix of 2. Because of its straightforward implementation in digital electronic circuitry using logic gates, the binary system is used internally by almost all modern computers and computer-based devices. Each digit is referred to as a bit.
| binary (base 2) | 12 | 102 | 112 | 1002 | 1012 | 1102 | 1112 | 10002 | 10012 | 10102 |
| hexadecimal (base 16) | 120 | 220 | 320 | 420 | 520 | 620 | 720 | 820 | 920 | a20 |
| hexadecimal (base 16) | 120 | 220 | 320 | 420 | 520 | 620 | 720 | 820 | 920 | a20 |
|---|---|---|---|---|---|---|---|---|---|---|
| binary (base 2) | 12 | 102 | 112 | 1002 | 1012 | 1102 | 1112 | 1 0002 | 1 0012 | 1 0102 |