How to round off values in rdlc report

Question

I am working in c# Windows forms in that I want to round off values in rdlc report. Eg. I have two values 256.29+32.40=288.69, it should be round off as 0.31 and grand total as 289.00 like this in rdlc report. How to do this? I don't know whether round off value will give to Windows forms or runtime on rdlc report.