Subtracting Mixed Time

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.