Gym class drill: balls bingo

The teacher puts numbers 1 to 20 on 20 tennis balls (for a lesson with 20 students).
The teacher gives each student a piece of paper with his/her own number on it.
The game begins. All balls are thrown around the room at the same time.
The students have to look for their own ball.
When a student has checked a ball and it is not his/her ball, the student may roll the ball away on the floor.
Does the pupil find the ball?
Then he/she goes to the teacher who stands at the side of the hall.
The teacher then checks if the number is correct with the number on the paper.
The first one with the right ball to the teacher wins.
The game stops when 10 students have found their ball.

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Not applicable