The decimal fraction 45.0302 is written as "forty-five and three hundred two ten-thousandths".
Convert a number to a word representation using the CalculatorSoup's Numbers to Words Converter.
Except for a few basic rules, spelling out numbers vs. using figures (also called numerals) is largely a matter of writers' preference.
Policies and philosophies vary from medium to medium. America's two most influential style and usage guides have different approaches: The Associated Press Stylebook recommends spelling out the numbers zero through nine and using numerals thereafter—until one million is reached.
The Chicago Manual of Style recommends spelling out the numbers zero through one hundred and using figures thereafter—except for whole numbers used in combination with hundred, thousand, hundred thousand, million, billion, and beyond.
See the rules for writing numbers at GrammarBook.com.
DailyWritingTips also shares 10 Rules for Writing Numbers and Numerals.
Tip! Find out When to Spell Out Numbers at WritersDigest.com.