The number of new students decreased from 210 to 160 this year.
今年新生人數從210減少到160。
I could give you any number of reasons for not going.
我可以給你許多不去的理由。
In case you should need any help, here's my number.
萬一你需要幫助的話，這是我的電話號碼。
I have a number of things to do today.
我今天有許多事情要做。
Double the expected number of people came to the meeting.
出席會議的人數比預期的多一倍。