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My son is doing this in 6th grade math class. Mr. Weiss started painting the kitchen at 8:45 am and finished painting at 12:00 pm. About how many hours elapsed between the time he started painting and the time he finished painting the kitchen? Answers are 2h, 3h, 4h, and 5h. He knows that there is 3 hours and 15 minutes but is not sure when asking about how many hours does he round up to 4 hours or keep it at 3 hours?

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    He rounds down to 3 hours since 15 minutes is less than half an hour.

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