Template:Convert/sround
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{{formatnum?:{{rnd{{{?}}}|{{{2}}}|({{{4}}}-{{Order of magnitude{{{?}}}|{{{2}}}}}-1)}}}}
{{formatnum?:{{rnd{{{?}}}|{{{2}}}|({{{4}}}-{{Order of magnitude{{{?}}}|{{{2}}}}}-1)}}}}