Csdrhrt

This question is related to this one: Colour only the text in a tabularx environment

I want to write as a succession of equality in blue (only the numbers) so that each line of the table has a corresponding equality line to its right.

documentclass{article}

usepackage{amsmath,numprint,tabularx,xcolor}



begin{document}

begin{minipage}{.4linewidth}

begin{tabularx}{5cm}{|*{11}{>{leavevmodecolor{blue}}X|}}

hline

multicolumn{2}{|c|}{$rm m^2$} & 

multicolumn{2}{c|}{$rm dm^2$} & 

multicolumn{2}{c|}{$rm cm^2$} & 

multicolumn{2}{c|}{$rm mm^2$} \

hline

&&&4,&&&& \

&&&4&0&0&0& 0,\

&0,&0&4&&&& \

hline

end{tabularx}

end{minipage}quad

begin{minipage}{.2linewidth}

begin{align*}

&numprint[dm^2]{4}\

&=numprint[mm^2]{40000}\

                    &=numprint[m^2]{0,04}

end{align*}

end{minipage}



end{document}

In the numprint manual, there is a hack that allows you to color the negative numbers on pages 18-19, I couldn't modify it to write the numbers in blue.

makeatletter

expandafterrenewcommandcsname nprt@sign@-endcsname{%

color{red}{ensuremath{-}}}

makeatother

Here's an option using a single tabular for better vertical alignment:

documentclass{article}



usepackage{numprint,xcolor}



begin{document}



begin{tabular}{| *{8}{>{color{blue}}l|} >{color{blue}} l }

  cline{1-8}

  multicolumn{2}{|c|}{$mathrm{m}^2$rule{0pt}{normalbaselineskip}} & % added some vertical padding

    multicolumn{2}{c|}{$mathrm{dm}^2$} & 

    multicolumn{2}{c|}{$mathrm{cm}^2$} & 

    multicolumn{2}{c|}{$mathrm{mm}^2$} \

  cline{1-8}

  phantom{0,} &    &   & 4, &   &   &   &    & {}    phantom{=}   numprint[color{black}dm^2]{4}     \

               &    &   & 4  & 0 & 0 & 0 & 0, & {} {color{black}=} numprint[color{black}mm^2]{40000} \

               & 0, & 0 & 4  &   &   &   &    & {} {color{black}=} numprint[color{black}m^2]{0,04}   \

  cline{1-8}

end{tabular}



end{document}

The entire numprint-column is set in color{blue} with each unit set in color{black} (as well as the =).

You can locally patch numprint to set color{black} for the optional argument.

Note that tabularx is not the right tool for the job.

documentclass{article}

usepackage{amsmath,numprint,array,xcolor,xpatch}



begin{document}



begingroup

makeatletter

xpatchcmd{numprint}

 {defnprt@oarg{#1}}

 {defnprt@oarg{color{black}#1}}

 {}{}

makeatother



begin{tabular}{ |*{8}{>{color{blue}}w{c}{1em}|}>{color{blue}}l }

cline{1-8}

multicolumn{2}{|c|}{$mathrm{m}^2vphantom{Big|}$} & 

multicolumn{2}{c|}{$mathrm{dm}^2$} & 

multicolumn{2}{c|}{$mathrm{cm}^2$} & 

multicolumn{2}{c|}{$mathrm{mm}^2$} \

cline{1-8}

&&&4rlap{,}&&&&& numprint[dm^2]{4} \

&&&4&0&0&0& 0rlap{,} &= numprint[cm^2]{40000} \

&0rlap{,}&0&4&&&&& = numprint[m^2]{0,04} \

cline{1-8}

end{tabular}

endgroup



end{document}

With siunitx:

documentclass{article}

usepackage{amsmath,siunitx,xcolor}



sisetup{

  output-decimal-marker={,},

  power-font=unit,

}



begin{document}



begingroup

sisetup{

  number-color=blue,

}

begin{tabular}{ |*{8}{>{color{blue}}w{c}{1em}|}l }

cline{1-8}

multicolumn{2}{|c|}{si{squaremeter}$vphantom{Big|}$} & 

multicolumn{2}{c|}{si{squaredecimeter}} & 

multicolumn{2}{c|}{si{squarecentimeter}} & 

multicolumn{2}{c|}{si{squaremillimeter}} \

cline{1-8}

&&&4rlap{,}&&&&& SI{4}{squaredecimeter} \

&&&4&0&0&0& 0rlap{,} &= SI{40000}{squarecentimeter} \

&0rlap{,}&0&4&&&&& = SI{0,04}{squaremeter} \

cline{1-8}

end{tabular}

endgroup



end{document}