We will learn how to addition and subtraction of units of time.
1. Add 25 minutes 45 seconds and 15 minutes 25 seconds.
Solution:
First add the seconds 45 + 25 = 70 seconds Convert 70 seconds into minutes and seconds 70 seconds = 60 seconds + 10 seconds Carry 1 minute to minutes column and write 10 in seconds column 
Therefore, 25 minutes 45 seconds + 15 minutes 25 seconds = 41 minutes 10 seconds
3. Add 9 months 25 days 21 hours and 7 months 20 days 13 hours.
Ans: 17 months 16 days and 10 hours 
Step I: Add the hours 21 + 13 = 34 hours = 24 hours + 10 hours = 1 day 10 hours Step II: Write 10 under hours and carry 1 to days. Step III: Add the days. 1 + 25 + 20 = 46 days = 30 days + 16 days = 1 month 16 days Step IV: Write 16 under days and carry 1 to months. Step V: Add the months 1 + 9 +7 = 17 months Write 17 under months 
2. Add 5 weeks 4 days and 4 weeks 5 days
Solution:
First add days, 4 + 5 = 9 days Convert 9 days into weeks and days 9 days = 7 days + 2 days = 1 week and 2 days Carry 1 to week column and write 2 in days column. 
Therefore, 5 weeks 4 days + 4 weeks 5 days = 10 weeks 2 days
3. Subtract 18 minutes 29 seconds from 24 minutes 15 seconds
Solution:
First subtract seconds Since we cannot subtract 29 from 15, we borrow 1 minute. So, 15 + 60 = 75 seconds 75 – 29 = 46 seconds Write 46 in seconds column Now subtract minutes 23 – 18 = 5 minutes, write 5 in minutes column 
Therefore, 24 minutes 15 seconds  18 minutes 29 seconds = 5 minutes 46 seconds
4. Subtract 7 years 6 months from 8 years 3 months
Solution:
First subtract the months We borrow 1 year and subtract, 16 – 6 = 9 months Write 9 in months column and now subtract 7 – 7 = 0 Write 0 in years column. 
Therefore, 8 years 3 months  7 years 6 months = 9 months
1. Subtract 6 hours 40 minutes from 8 hours 55 minutes
Step I: Subtract the minutes. 55 – 40 = 15 minutes Step II: Subtract hours. 8 – 6 = 2 hours 
Ans: 2 hours 15 minutes 
2. Subtract 10 hours 50 minutes from 12 hours 45 minutes.
Ans: 1 hour 55 minutes 
Step I: We cannot subtract 50 minutes from 45 minutes. So borrow 1 hour from 12 hours. 1 hour = 60 minutes 60 + 45 = 105 minutes Step II: Subtract minutes. 105 – 50 = 55 minutes Write 55 under minutes. Step III: 12 – 1 = 11 hours remain in hours Step IV: Subtract hours. 11 – 10 = 1 hour Step V: Write 1 under hours. 
Questions and Answers on Adding and Subtracting Time:
I. Add the following.






II: Subtract the following.


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