The best replacement for rounding is estimating.

The best alternatives to rounding are rated as following:
★★★★★  estimating
★★★★  compatible numbers
★★★  truncation
★★★  truncating
★★★  estimating numbers
★★  estimation
★  compatible
★  front end estimation
★  truncate
  chopping

Your alternative for rounding is not listed? Suggest!
Speaking about rounding, one probably shouldn't forget about decimals.

Other search terms related to rounding and their ratings are:
★★★★★ decimals
★ bigdecimal
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Google Trends

Scale is based on the average worldwide traffic of rounding in all years. Click on graph for more.
rounding
estimating
compatible numbers