Help 3rd graders find elapsed time from a start time to an end time with a clear open number line routine. These elapsed time task cards give students repeated practice with Start -> Jump -> End modeling, including same-hour problems, across-the-hour problems, one-hour-plus problems, and challenge routes. Each card includes the start time, end time, and space for students to model forward jumps. The answer key lists the number-line jumps, answer, and explanation for every card, so this wor