qián
Money
In speech the yuan is 块 (kuài); on a price tag it is 元 (yuán). A price is a number plus 块: 十块 is ten yuan.
Grammar rule: Counting money with 块
shí kuài
10 yuan
liǎng kuài
2 yuan
sān kuài wǔ
3.50 yuan
jiǔ kuài jiǔ
9.90 yuan
yìbǎi líng wǔ kuài
105 yuan
duōshao qián?
How much is it?
tài guì le.
That is too expensive.
piányi yìdiǎn ba.
Could you make it cheaper?
yígòng sānshíwǔ kuài.
35 yuan altogether.
多少钱? (duōshao qián?) — literally "how much money?".
They are the same unit, the yuan. 块 (kuài) is spoken; 元 (yuán) is written on price tags and receipts.
三块五 (sān kuài wǔ). The full form is 三块五毛, but the final 毛 is usually dropped.
Tomyo
Numbers stick when you use them. Tomyo reviews your words on a schedule so what you learn is still there a month later.