This math topic focuses on calculating elapsed time with negative increments, by determining the new time after a specified change. It entails predicting the resulting time after subtracting minutes from a given start time on a clock. Each question provides a scenario involving a reverse calculation with time, enhancing the learners' ability to think inversely about time and improve their overall time management skills. This practice is essential for real-life applications such as adjusting schedules and understanding time durations inversely.