The decimal numeral system (also called base-ten positional numeral system, and occasionally called denary) is the standard system for denoting integer and non-integer numbers. It has ten as its base.
| decimal | hexadecimal (base 16) | decimal | hexadecimal (base 16) |
|---|---|---|---|
| 1 | = 1 | 11 | = b |
| 2 | = 2 | 12 | = c |
| 3 | = 3 | 13 | = d |
| 4 | = 4 | 14 | = e |
| 5 | = 5 | 15 | = f |
| 6 | = 6 | 16 | = g |
| 7 | = 7 | 17 | = h |
| 8 | = 8 | 18 | = i |
| 9 | = 9 | 19 | = j |
| 10 | = a | 20 | = 10 |
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) | decimal | hexadecimal (base 16) | decimal |
|---|---|---|---|
| 1 | ≈ 1 | b | ≈ 11 |
| 2 | ≈ 2 | c | ≈ 12 |
| 3 | ≈ 3 | d | ≈ 13 |
| 4 | ≈ 4 | e | ≈ 14 |
| 5 | ≈ 5 | f | ≈ 15 |
| 6 | ≈ 6 | g | ≈ 16 |
| 7 | ≈ 7 | h | ≈ 17 |
| 8 | ≈ 8 | i | ≈ 18 |
| 9 | ≈ 9 | j | ≈ 19 |
| a | ≈ 10 | 10 | ≈ 20 |
| decimal | hexadecimal (base 16) |
|---|---|
| 1 | = 1 |
| 2 | = 2 |
| 3 | = 3 |
| 4 | = 4 |
| 5 | = 5 |
| 6 | = 6 |
| 7 | = 7 |
| 8 | = 8 |
| 9 | = 9 |
| 10 | = a |