Cherry also had seven rebounds and six assists. Keron DeShields chipped in 13 points off the bench for the Grizzlies (15-4, 11-0), who maintained their two-game conference lead over second-place Weber State.
Aaron Moore had 14 points for the Vikings (5-13, 3-8), who lost their fifth straight. Portland State, playing its first home game in 19 days, outrebounded Montana 32-23 but committed 12 turnovers that the Grizzlies turned into 17 points.
Portland State led for much of the first half, but Montana closed on a 10-2 run to lead 39-31 at halftime. The Grizzlies never looked back, increasing their lead to as many as 17 points in the second half.
Montana shot 56 percent from the floor, including 67 percent after halftime.