It depends what comes next. For example, the 't' is not pronounced in 'vingt', but it is pronounced in 'vingt-et-un'. Of course, the rules of 'liaison' apply to all sorts of French words, not just numbers.

Bonjour Compléments.. Pour faire la liaison la consonne finale se prononce ; - 'z' pour deux, trois, six, dix. Ex : deux heures... : [døz-œːʁ, tʁwaz-œːʁ, siz-œːʁ, diz-œːʁ]. - 'v' pour neuf : [nœv-œːʁ]. Le chiffre sept se prononce toujours set : [sɛt.,sɛt-œːʁ.]

Thank you :)

Hi Luna! Well, I hope I understood your question well! There is no rule really for numbers, as it depends of the number! I think that we could say that your pronounce the last letter of these ones: 5 CINQ, 6 SIX (pronounce SIS), 7 SEPT (don't pronounce the -p), 8 HUIT, 9 NEUF, 10 DIX (pronounce DIS). So when they are in a higher number, for instance 38 TRENTE HUIT, you have to pronounce them with their last letter as well! I hope it was useful, Good luck!