This article attempts to introduce the reader to computational thinking and solving problems involving randomness. The main technique being employed is the Monte Carlo method, using the freely available software "R for Statistical Computing." The author illustrates the computer simulation approach by focusing on several problems of increasing difficulty. The simulation techniques and the specific problems discussed in this article would be of interest to STEM students and instructors, teaching courses in Monte Carlo simulations, stochastic modeling and probability and statistics. The "R" code for all problems is discussed in full detail so that the reader can get a taste of the functionality and unique simulation and visualization features that "R" offers. (Contains 5 figures.)