👉 The term "nineteenth" in math and English is used to denote a decimal number less than one. It is commonly represented as 0.1, 0.01, or even as a single digit numeral without any specific symbol. These numbers are often used for representing fractions or percentages that represent parts of a whole. For example, if you wanted to know how many fifths (f) there would be in 25%, you could write it as 0.2