Template:Significant figures

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{{#ifeq:0|0

|0
|{{significant figures/{{#if:
  |rnd
  |sum
 }}
 |1={{{1}}}
 |2={{{2}}}
 |3={{safesubst:#ifexpr:{{{1}}}=0
  |{{safesubst:#ifexpr:abs{{{1}}}1=1
     |0
     |{{safesubst:#expr:floor((ln(abs{{{1}}}1)/ln10)+1)}}
   }}
  |{{#expr:floor((ln(abs({{{1}}}) )/ln 10)+1E((abs{{{1}}}>1E100 or abs{{{1}}}<1E-100)-14))}}

}}

}}

}}

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