This math topic focuses on calculating the difference in times between two clocks, expressed as hours and minutes earlier. It requires the skill of reading and comparing times from clocks and calculating elapsed negative time. The problems ask participants to determine how many full hours or specific minutes one time is earlier than another by observing images of two different clock faces. This is part of a broader unit on practicing negative elapsed time skills.

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