Purdue leads Ball State 27-21 at halftime Tuesday at Mackey Arena.
A.J. Hammons has 10 points and four rebounds for the Boilermakers. Jacob Lawson has four points and seven rebounds.
Terone Johnson has six points for Purdue.
The Boilermakers shot 35.3 percent from the floor. Ball State shot 32 percent.
Jesse Berry leads the Cardinals with nine points.