This math topic involves calculating negative elapsed time, specifically subtracting 30 minutes from given times. The problems present a variety of starting times, and the task is to determine the resulting time after the subtraction. The examples start from different half-hourly times—11:30, 10:30, 9:30, and 3:30—and involve understanding how to work backwards in calculating time. The aim is to reinforce the concept of time subtraction and interpreting such changes on an analog clock, enhancing students' ability to adjust and read times accurately.
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What will the time be after the given change?
11:30
Subtract 30 mins