I have very limited knowledge of betting but I think it depends where you bet, each place has its own thing going on.
https://gamefaqs.gamespot.com/a/forum/2/284f1bc8.jpg
Like here it has the Pacers at +235, and I believe that means that if you bet 100 dollars for them to win and they win then you'll win 235 dollars. Each place has its own different number I believe, and these numbers can change (even drastically) over time
http://www.interbasket.net/news/wp-content/uploads/2009/09/danilo_gallinari.jpg