90/180 rule while holding a work permit from norway [duplicate]

I am a Indian citizen holding a work residence permit from Norway for two years. I want to make some trips in the rest of the Schengen area. I am planning my first trip to Portugal on 22/08/18 till 26/08/18, a second trip to Italy from 22/11/18 to 27/11/18, and again to Portugal from 06/02/19 to 16/02/19. I will stay permanently inside Norway after each trip to other Schengen countries. How does the 90/180 rule work in this case? Am I allowed to make all those trips while holding my residence permit in Norway? Can you let me know if I'm exceeding the 90-day limit with these trips?