wrong change =找错钱

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Give someone the wrong change给某人找错钱

The cashier gave me the wrong change. I gave her 10 dollars to pay for a $5.00 book, and she only gave me 2 dollars back.

收银员给我找错钱了。我买了5美元一本的书，给了她10美元，但她只给我找了2美元。

too much change =多找钱

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give someone too much change给某人多找了

If a cashier gives you too much change, you'd better give it back.

如果收银员给你多找钱了，最好还回去。

short change =少找钱

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I think I was shortchanged in the restaurant, because I've only got $10 in my wallet when I should have $20 .

我感觉饭店给我少找钱了，因为我钱包里只有10美元，本来应该有20的呀。

或者，可以说

not give someone enough change =少找钱

He did not give enough change, and people did not notice.

他没有找够钱，人们也没有注意到。

loose change =零钱、散钱

I have some loose change in my pocket. I'll use it to buy something in the vending machine.

我口袋里有些零钱，我准备拿去自动售货机上买些东西。

price difference =价差

There's always a big price difference between a new car and a used car.

新车和二手车的价格总是有很大的差别。