This math topic focuses on calculating elapsed time with negative durations, specifically understanding how the clock changes over full hours. It is targeted at the introductory level of calculating negative elapsed time. The problems involve predicting time changes after subtracting full hours; each problem presents a given current time and a full hour decrement to determine the new time. Several answers are proposed for each situation, and the learner must select the correct resulting time. This is part of a broader study on handling time subtraction and understanding time in a more advanced conceptual manner.

Work on practice problems directly here, or download the printable pdf worksheet to practice offline.