- #1

jayadds

- 42

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**How to round off percentage uncertainties?**

Here's is an example question:

Find the percentage of uncertainty in (225.7+/-0.5)mm.

I know that to find out percentage, it's simply 0.5/225.7 x 100 = 0.22153088...%

Now, my question is, how much do I round off for this percentage uncertainty? Should I just round it off to one significant figure? Or Is there a certain rule?