You are going to be working with a partner and both of you will be taking turns to estimate how much time you think has gone by.
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Take turns using a stopwatch to estimate when you think 15 seconds, 30 seconds, 45 seconds, and 60 seconds have gone by.
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Each time one of you has the stopwatch and says "Go" while the other says "Stop" when they think the correct number of seconds has gone by.
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Reset the stopwatch to 0 after each estimation.