In this calculate time intervals in 12 and 24 hour systems worksheet, 4th graders solve 4 time interval problems in a 12 hour system and 4 in a 24 hour system with immediate online feedback.

In this 12-hour and 24-hour clocks worksheet, students solve 40 problems. Students convert the times back and forth between the 2 systems. This page was intended to be an online activity, but can be completed with pencil and paper.