In mathematics, the need for breaking down complex problems and easing the calculations is critical. Thus, ‘Magical Concept of Digit sum’ the activity was conducted for the students of grades IX to XII. This activity helped the students solve the day-to-day problems and also made doing lengthy calculations easily without errors. The concept was explained through several examples and the students were also given few problems to solve on their own. This way, they understood the underlying fragments of the concept clearly with better understanding.