LabVIEW only readily supports rounding numbers to integer values. For example, LabVIEW rounds the number 543.21 to 543.00.
This VI shows how to round numbers to values other than integers. For example, you can round the number 543.21 to 543.20 or 540.00 by choosing which decimal place you want to round to.
Example code from the Example Code Exchange in the NI Community is licensed with the MIT license.