A five-dollar bill changes into five one-dollar bills.
一张5美元的钞票破成5张一美元的钞票。
《新英汉大辞典》
2
Twenty cents is a fifth of onedollar.
二十美分是一美元的五分之一。
3
The good negotiators set their objectives in terms of range, which they might formulate as "We hope to get two dollars, but if we get onedollar and fifty, it will be all right."