345 in words

345 is written "three hundred forty-five". British English inserts "and" before the final part, giving "three hundred and forty-five"; American English leaves it out.

Where each word comes from

The same number, other ways

In words (US)

Three hundred forty-five

In words (UK)

Three hundred and forty-five

Ordinal

345th — three hundred forty-fifth

Roman numeral

CCCXLV

Digits

345

Writing it on a cheque

On a cheque the amount line reads "Three hundred and forty-five and 00/100" — or "Three hundred and forty-five 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.