Onethirtieth

Onethirtieth refers to the fraction 1/30, representing one part of a whole divided into thirty equal parts. It is a unit fraction and is already in lowest terms, since the numerator 1 shares no common factors with the denominator 30.

In decimal form, one-thirtieth equals 0.033333..., with the digit 3 repeating indefinitely. As a percentage, it is approximately 3.333... percent. Because it is the reciprocal of 30, it can be used to describe small portions, rates, or probabilities where an event would occur in about one out of thirty trials.

In practical use, one-thirtieth appears in contexts such as measurements, recipes, statistics, and probability. For example, describing a quantity that is one-thirtieth of a unit or stating a probability of 1 in 30 corresponds to a one-thirtieth chance.

Orthography and pronunciation vary. When written in words, the standard form is one-thirtieth; the closed form onethirtieth is generally considered nonstandard in modern English, though it may appear in some datasets or specialized nomenclature. The term reflects common English practice for naming fractions with ordinal denominators, where the numerator precedes the denominator’s ordinal form.

See also: fractions, unit fractions, decimal representations, percentages, probabilities.