This study was prepared at the aim of teaching of the law of radioactive decay. The formula of the law of radioactive decay was tried to reach by using of 200 coins and with 200 procreated numbers in simulation to represent a radioactive element. With the data obtained, it was requested that the linear and exponential graphs be drawn connecting with the number of tails to the number of tosses. The students could match up the concepts used in the modeling to the concepts in nuclear physics and reached the law of radioactive decay's formula in broad terms. (C) 2011 Published by Elsevier Ltd.