I support oreg's proposal to strike the entry since it's clearly incorrect.
"to round" = "to round off" = "runden" [already in LEO]
"round-off error" = "Rundungsfehler" [already in LEO]
Two examples demonstrating typical usage of "to round off":http://dbhs.wvusd.k12.ca.us/webdocs/SigFigs/R...
Rules for Rounding Off
Now that "everyone" has a calculator that will give a result to six or eight (or more) figures, it is important that we know how to round the answer off correctly. The typical rule taught is that you round up with five or more and round down with four or less.http://www.themathpage.com/ARITH/divide-whole...
Example 3. Round off 7.253896 to the nearest tenth.
Answer. 7.253896 ≈ 7.3
To round off to the nearest tenth, means to keep one decimal place. (To round off to the nearest hundredth would mean to keep two places; to the nearest thousandth, three; and so on. Lesson 2, Question 6.) Now, the digit in the second decimal place is 5. Therefore add 1 to the previous digit 2.