720 in words

720 is written "seven hundred twenty". British English inserts "and" before the final part, giving "seven hundred and twenty"; American English leaves it out.

Where each word comes from

The same number, other ways

In words (US)

Seven hundred twenty

In words (UK)

Seven hundred and twenty

Ordinal

720th — seven hundred twentieth

Roman numeral

DCCXX

Digits

720

Writing it on a cheque

On a cheque the amount line reads "Seven hundred and twenty and 00/100" — or "Seven hundred and twenty only" in Indian and much of Commonwealth practice. The fraction or the word "only" exists to stop anyone appending digits after what you wrote. Draw a line through any space left over for the same reason.