He's two and a half now.他现在两岁半了。

I paid two and a half thousand pounds.我付了2,500英镑。

a week and a half一周半

I think I got there about four and left about half past.我想我到那儿时大约4点, 离开时大约4点半。

It's half past three.现在3点半。

We close at half two.我们两点半关门。