"Both my arms are broken."
Translation:Begge armene mine er brukne.
From Numbers' Tips & Notes:
"There are two words for both in Norwegian, både and begge. Både is a conjunction and is used in constructions such as både ... og ..., ie. both ... and .... In this case it is possible to list more than two elements. Begge is a quantifier and is used instead of alle when there are only two of something. If you need to use the word both on its own, you may use the phrase begge to, which literally means, both two."