1.Exchange　兑换

make an exchange of 500 yuan into dollor

兑换500元的美元。

exchange student 交换生
2.account number　账户号
3.denomination 币值，纸币面额

It will be easier to issue bigger denomination while more difficult to control the counterfeit money.

发行大面额纸币会很简单，但由此造成的假币问题将更难控制。