Hi Xan,

It's not exactly what you want, but maybe it'll give you some other ideas:

\definemathmatrix[pmatrix][
  left={\left(\,},
  right={\,\right)},
]

\definenumber[pmatrix]
\resetnumber[pmatrix]

\define\nextmatrix{
  \incrementnumber[pmatrix]
  \getnumber[pmatrix].
}

\define[2]\pmatrices{
  \blank[big]
  \framed[frame=off]{
    \startmixedcolumns[n=#1]
      #2
    \stopmixedcolumns
  }
}

\starttext
Digueu quines de les matrius següents són regulars. Quan ho siguin,
trobeu la inversa

\pmatrices{4}{
  \nextmatrix
  \startpmatrix
    \NC 2 \NC 3 \NR
    \NC 6 \NC 7 \NR
  \stoppmatrix
  \column

  \nextmatrix
  \startpmatrix
    \NC 3 \NC 2 \NC 1 \NR
    \NC 4 \NC 5 \NC 3 \NR
    \NC 5 \NC 0 \NC -2 \NR
  \stoppmatrix
  \column

  \nextmatrix
  \startpmatrix
    \NC 5 \NC 4 \NC 2 \NR
    \NC 2 \NC 2 \NC 3 \NR
    \NC 7 \NC 6 \NC 5 \NR
  \stoppmatrix
  \column

  \nextmatrix
  \startpmatrix
    \NC a \NC 0 \NC 0 \NC 0 \NR
    \NC 0 \NC b \NC 0 \NC 0 \NR
    \NC 0 \NC 0 \NC c \NC 0 \NR
    \NC 0 \NC 0 \NC 0 \NC d \NR
  \stoppmatrix
}
\stoptext
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