Calculating Elapsed Time Using the 24-Hour Clock

MatholiaChannel

This educational math video demonstrates how to solve time-based word problems using the 24-hour clock format. It presents three distinct scenarios: calculating the total duration of an activity given start and end times, determining a finishing time given a start time and duration, and finding a starting time given a finish time and duration. The video uses a visual "bridging" strategy, breaking down time intervals into manageable chunks to cross hour boundaries easily. The key theme is mastering elapsed time calculations by "making it to the hour" first. Rather than trying to subtract or add complex minutes directly, the narrator shows students how to jump to the nearest hour (e.g., 12:00 or 19:00) and then handle the remaining minutes. This mental math strategy builds number sense and helps prevent common errors associated with the base-60 time system. For educators, this video is an excellent resource for modeling procedural thinking in calculating time. It visually represents the abstract concept of elapsed time through handwritten animations that simulate a number line approach. It is particularly useful for students struggling with the transition between hours or those who need practice with 24-hour time notation. The clear, step-by-step narration makes it suitable for direct instruction or independent review stations.