(1) Enter a big number. (It can even be bigger than this box!) (This number can be rounded to: ) (2) Say the number out loud.
to do this--and of course this will show how we say the numbers. In writing large numbers, American English uses a comma ( , ) to separate thousands, millions, ...
If you choose to spell out numbers because one of the numbers is a single digit, spell out all numbers in ... The simplest way to express large numbers is best.