Angel,
Please post in "Visual Basic.Net" in the future. This also sounds like homework which is against the rules and this post will likely get deleted.
I won't give you an example but some advice. Declare variables to hold the whole numbers as data type that is for whole numbers. If you do a multiply/divide on these, the returned data type will likely not be a datatype that is for whole numbers. In that case you can do a little research to get these back to whole numbers.
Homework is important and for the lesson, you should research:
cLng() or cInt()
[Integer/Long].[Parse()/TryParse()]
Math.floor
Math.ceiling
Math.round
Data Types