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.


From Adding and Subtracting Time to HOME PAGE
Didn't find what you were looking for? Or want to know more information about Math Only Math. Use this Google Search to find what you need.
Jul 20, 24 03:45 PM
Jul 20, 24 02:30 PM
Jul 20, 24 12:03 PM
Jul 20, 24 10:38 AM
Jul 20, 24 01:11 AM
New! Comments
Have your say about what you just read! Leave me a comment in the box below. Ask a Question or Answer a Question.