"Round " how to say with English?

"Round " how to say with English?

Similar statement has:

One, Round Sth. Off

To Change A Number To The Next Higher Or Lower Whole Number, namely melt into is integral

For example:

I Rounded Off 10.123 To 10.

2, Round Down is similar " 4 abandon " , change downward namely whole, round Up is similar " 5 enter " , namely upgrade is changed whole

For example:

You Should Round $99.99 Up To $100.

I Rounded Down 9.123 To 9.