It was the first time this season that the Tar Heels (5-1) have topped the century mark. They put up 62 points in the first half after being held to 18 points in the first half in Tuesday's loss to Butler.
Tournament host Chaminade (3-3) scored consecutive baskets just three times.
McAdoo had 10 rebounds for a double-double. Reggie Bullock and Leslie McDonald scored 17 points each and Brice Johnson had 16.
UNC shot 62.3 percent, making nearly 69 percent of its shots in the first half including nine 3-pointers.
The Tar Heels overwhelmed Chaminade 62-33 at the break.
The Silverswords had a 7-4 lead in the game's second minute, but Carolina scored 15 straight and Chaminade never came close after that. Chaminade had 12 turnovers in the half, leading to 21 UNC points, while the Tar Heels had three runs of six or more points each.
It was Carolina's best scoring half since the Tar Heels put up 60 in in the second half in November 2011 against Mississippi Valley State. North Carolina had three players with at least 10 points each at halftime.
UNC reached 100 points when Jackson Simmons made an easy layup with 6:35 left.
The win loosened up North Carolina (5-1) and its fans before it flies home Thursday and faces top-ranked Indiana in the ACC/Big Ten Challenge next week.
Even coach Roy Williams chuckled when some Carolina fans heckled reserve Wade Moody for airballing a 3-pointer in the game's final minute.
Chaminade was hoping for a second upset after it beat Texas in the opening round of the tournament. It lost to Illinois on Tuesday.
North Carolina easily beat Mississippi State in the second round.