Steps to subtract days and hours:
1. If the number of hours being subtracted is more, then decrease the days by 1 and increase the hours by 24.
(Since, 1 day = 24 hours)
2. Subtract the days.
3. Subtract the hours.
For example: Let's subtract:
39 days 21 hours – 15 days 23 hours = ?
Notice that, we cannot subtract 23 hours from 21 hours.
So, decrease the days by 1 and increase the hours by 24:
39 days – 1 day = 38 days
21 hours + 24 hours = 45 hours
So, 39 days 21 hours – 15 days 23 hours = 38 days 45 hours – 15 days 23 hours
Now, subtract the days.
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The correct answer is
The smallest number is the one that comes first while counting.
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21 is the smallest number.