Is it "twenty-one" or "twenty one"? Does the "and" go after the hundreds or the thousands? Language rules for numbers can be surprisingly complex, and they often vary between American and British English. For writers and editors, consistency is the key to authoritativeness.
By mastering the foundational rules of number-to-words conversion, you elevate the quality of your prose. Understanding the nuances of hyphenation and the common errors that trip up even seasoned professionals will make your work stand out for its technical excellence.
See rules and examples: Number to Words Conversion: Rules, Examples & Common Errors