Computer Science Unplugged (CSU) is an effective educational method to learn concepts of Computer Science through hands-on activities that do not require the use of a computer. However, in some cases, it is difficult for teachers to prepare enough numbers of tools for CSU activities. Therefore, we developed AR balance scale (AR- BS) for a CSU activity to learn sorting algorithms. We also propose some worksheets for understanding quicksort programs using arrays. In our experiment, AR-BS with the worksheets helps to improve learners’ understanding quicksort programs.