Number to words
Spell a number out in English, including the form cheques need.
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How it works
Writing a number out in words is required on cheques, in contracts and in formal documents, precisely because words are harder to alter than digits. It is also surprisingly easy to get wrong past a few thousand.
Cheque format
Cheques conventionally use the words followed by the cents as a fraction — “One thousand two hundred and thirty-four and 56/100”. That form is given directly, since it is the reason most people look this up.
British and American conventions
The “and” before the tens (“one hundred and five”) is standard British usage; American English usually drops it. Both are universally understood, and cheques are accepted either way.
Large numbers
Thousands, millions, billions and trillions are handled, using the short scale where a billion is a thousand million — the convention in English-speaking countries and in finance everywhere.
Ordinals too
The ordinal form (first, second, twenty-third) is given alongside, which is what you want for dates, rankings and clause numbering.
Number to words — questions
What format do cheques need?
The words followed by the cents as a fraction over 100, which is given directly.
Should I write “and” in the middle?
British usage includes it, American usually does not. Both are accepted on cheques.
How large a number can it handle?
Up to the trillions, using the short scale.