In speech recognition assessment, score measures such as accuracy , error rateerror rate , substitution rate, etc. are commonly expressed as percentages. This tends to lead to various factors of 100 in the formulas, which sometimes makes them less transparent. In order to define simpler formulas, the percent is to be interpreted literally, i.e. ``.'' Thus, one can view the percent as a dimensionless unit, of value 0.01. To convert a fraction to a percentage, multiply by 100 (i.e. divide by the ``unit'' %).