Nouns ending in -ence are usually feminine, but le pence is masculine.
Pence is one of the rare exceptions: learn it as it is.
Is pence masculine or feminine?
lepenceexception
Mostly used in the plural: les pence.
The rule behind it
97.6% of -ence nouns are feminine
In context
« Six pence à la seconde », lui rappela Bob.
"Six pence a second," Bob reminded him.
« Quatre livres, quatre-vingt-dix pence », répond Bob.
"Four pounds ninety pence," replies Bob.