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) | quaternary (base 4) | hexadecimal (base 16) | quaternary (base 4) |
|---|---|---|---|
| 1 | = 1 | b | = 23 |
| 2 | = 2 | c | = 30 |
| 3 | = 3 | d | = 31 |
| 4 | = 10 | e | = 32 |
| 5 | = 11 | f | = 33 |
| 6 | = 12 | g | = 100 |
| 7 | = 13 | h | = 101 |
| 8 | = 20 | i | = 102 |
| 9 | = 21 | j | = 103 |
| a | = 22 | 10 | = 110 |
Quaternary is the base-4 numeral system. It uses the digits 0, 1, 2 and 3 to represent any real number.
| quaternary (base 4) | hexadecimal (base 16) | quaternary (base 4) | hexadecimal (base 16) |
|---|---|---|---|
| 1 | ≈ 1 | 23 | ≈ b |
| 2 | ≈ 2 | 30 | ≈ c |
| 3 | ≈ 3 | 31 | ≈ d |
| 10 | ≈ 4 | 32 | ≈ e |
| 11 | ≈ 5 | 33 | ≈ f |
| 12 | ≈ 6 | 100 | ≈ g |
| 13 | ≈ 7 | 101 | ≈ h |
| 20 | ≈ 8 | 102 | ≈ i |
| 21 | ≈ 9 | 103 | ≈ j |
| 22 | ≈ a | 110 | ≈ 10 |
| hexadecimal (base 16) | quaternary (base 4) |
|---|---|
| 1 | = 1 |
| 2 | = 2 |
| 3 | = 3 |
| 4 | = 10 |
| 5 | = 11 |
| 6 | = 12 |
| 7 | = 13 |
| 8 | = 20 |
| 9 | = 21 |
| a | = 22 |