In American English, do not add "and" after thousand. "Thirty thousand and" implies a decimal point is coming next.
Since 30,000 is well below one million, it does not create confusion between scales.
This guide explains the linguistic rules, formatting conventions, and practical applications for writing 30,000 in words. The Basics: How to Spell 30,000 In English, the number 30,000 is expressed as: Thirty thousand 30,000 in ordinal form: Thirty thousandth Key Rules for Writing "Thirty Thousand" 1. The Use of Hyphens
