How do you write 3,999 in words?
3,999 = three thousand nine hundred ninety-nine
How to write $3,999 on a check
The most common reason to write 3,999 as three thousand nine hundred ninety-nine would be if you're writing a check for $3,999. Just below the "pay to the order of" line, you would write the dollar amount in words. In this case, you might write "three thousand nine hundred ninety-nine and 00/100 dollars."