1. divide students into teachers), 2 small plates and chaekkradat groups, student groups, 1, 2, and 1 telephone number pad number pad into two and then put in the box, the teacher.
1) Teachers Students were divided into two groups then distribute small piece of paper. The first two groups of students each sheet to write down the phone number one number two sheets of paper and then put it in a box prepared teachers.
1) were divided into 2 group to distribute the piece of paper to the students 1 different 2 plates, to write the phone number 1 number. In the paper the 2 sheet, then put in the box the teacher prepared .