[NTG-context] maths simplifying fractions

Hi Altoff. Maybe this markup will help? \startuniqueMPgraphic{cancel} pickup pencircle scaled 0.7pt ; path p ; p := OverlayBox topenlarged -ExHeight bottomenlarged -ExHeight ; draw llcorner p -- urcorner p withcolor OverlayColor ; \stopuniqueMPgraphic \defineoverlay[cancel][\uniqueMPgraphic{cancel}] \defineframed[cancel] [background=cancel,frame=off,offset=0pt,location=low] \starttext \startformula 6 \frac{3}{8} \div 4 \frac{1}{2} = \frac{27}{4} \div \frac{9}{2} = \frac{\cancel{27}^3}{\cancel{4}^2} \times \frac{\cancel{2}^1}{\cancel{9}^1} = \frac{3}{2} = 1 \frac{1}{2} \stopformula \stoptext HTH, kitz