I'use extensively context to write my lecture notes and for all of my printing 

For my students, I've made some lecture presentations in color, and I print 
them in black&white, with four pages on one page for the handout.

I would like to compute a correct Table of contents according to the handout : 
so to divide the current page number by four to get a correct page number for 
the handout.

\def\ChapterPrefix#1{\the\numexpr#1/4 \relax}

That doesn't work, and I've some difficulties to figure how computation is 
performed in e-TeX...

Could you help me to resolve this issue ?

Kind regards,
Pierre-François Bonnefoi.
Bonnefoi Pierre-Francois                |    E-mail : bonne...@unilim.fr
Universite de Limoges, Laboratoire XLIM |       Tel : 06 28 18 03 38
83, rue d'Isle                          |  Mrs. Peel, we're needed...
87000 Limoges - FRANCE                  |                 The Avengers.

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