How can I round off my fraction numbers?

I have some numbers such as 5.75, 3.25782, 15.25 etc. I want to round the numbers. Numbers below 0.5, I want them to be without fraction. And numbers above 0.5 I want to add plus one (+1). Is it possible in Microsoft Excel 2007?

If possible how can I do this? Please describe to me step by step.
