unit fraction
rational number written as a fraction where the numerator is one and the denominator is a positive integer
hundredth
one of hundred equal parts of a whole; single part of object that has been divided into a hundred equal parts
billionth
reciprocal of 1,000,000,000
thousandth
one of a thousand equal parts of a whole
parts-per notation
set of pseudo units to describe small values of miscellaneous dimensionless quantities
billionth
reciprocal of a billion (short scale) or of one thousand million (long scale)
millionth
1x10⁻⁶ in scientific notation