These end in -ence too, but they are masculine.
Quel est le numéro de téléphone d'urgence ?
What is the emergency telephone number?
En cas d'urgence, composez le cent dix.
In case of an emergency, dial 110.
En cas d'urgence, composez le cent dix-neuf.
In case of emergency, call 119.
FrenchTextbook teaches rules like this, in a full beginner course.
162 lessons, 4,000+ exercises, and 6+ hours of audio.