"The five daughters live at home."
Translation:Quinque filiae domi habitant.
Quinque is always the same, it doesn't decline but duo/duae does. Most cardinal numbers don't decline.
Information on which do and don't: http://dcc.dickinson.edu/grammar/latin/declension-cardinals-and-ordinals
-ne is added to the ended of habitas when you are making the statement into a yes or no question.
Habitasne Romae? -> 'Do you live in Rome?'
Romae habitas -> 'You live in Rome'.
Note that habitas is second person singular (used when talking to one person). Habitant, used here, is because the subject quinque filiae is third person here (they live).