Learn how to write 15000 in words as Fifteen Thousand using the place value chart. Find out the properties, facts and problems of 15000 in numbers and words. So, whenever you see 15000 in questions, cheques or notes, the correct way to spell it in English is " Fifteen Thousand ". Number to Word Conversion Chart (14000–16000) Numbers in Words: Here we show you how to write numbers in words, including cardinal and ordinal use, along with useful information about the numerals. Learn how to write 15000 in words as " Fifteen Thousand ." Understand its place value, usage in sentences, and examples to help with reading and writing large numbers clearly.