This is the 66th most frequent Norwegian word.
ganger
"Times" (as in occurrences or instances).
In this case, 'ganger' means 'paces' or 'small steps,' indicative of walking motion.
Han gikk ganger frem og tilbake i korridoren.
He paced back and forth in the hallway.
In this sentence, 'ganger' is used to mean 'times' as in instances of an action.
Jeg har besøkt Oslo mange ganger.
I have visited Oslo many times.
Here, 'ganger' refers to 'multiplication' in the context of mathematics.