We’ll discover ways to addition
and subtraction of models of time.
1. Add 25 minutes 45 seconds and quarter-hour 25 seconds.
Answer:
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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 |
Subsequently, 25 minutes 45 seconds + quarter-hour 25 seconds = 41 minutes 10 seconds
3. Add 9 months 25 days 21 hours and seven months 20 days 13 hours.
 Ans: 17 months 16 days and 10 hours |
Step I: Add the hours 21 + 13 = 34 hours        = 24        = 1 day Step II: Write 10 below hours and carry 1 to days. Step III: Add the times. 1 + 25 + 20 = 46 days                    =                    = Step IV: Write 16 below days and carry 1 to months. Step V: Add the months 1 + 9 +7 = 17 months Write 17 below months |
2. Add 5 weeks 4 days and 4 weeks 5 days
Answer:
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First add days, 4 + 5 = 9 days Convert 9 days into weeks and days 9 days = 7 days + 2 days       = 1 week and a pair of days Carry 1 to week column and write 2 in days column. |
Subsequently, 5 weeks 4 days + 4 weeks 5 days = 10 weeks 2 days
3. Subtract 18 minutes 29 seconds from 24 minutes 15 seconds
Answer:
 |
First subtract seconds Since we can’t 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 |
Subsequently, 24 minutes 15 seconds – 18 minutes 29 seconds = 5 minutes 46 seconds
4. Subtract 7 years 6 months from 8 years 3 months
Answer:
 |
First subtract the months We borrow 1 yr and subtract, 16 – 6 = 9 months Write 9 in months column and now subtract 7 – 7 = 0 Write 0 in years column. |
Subsequently, 8 years 3 months – 7 years 6 months = 9 months
1. Subtract 6 hours 40 minutes from 8 hours 55 minutes
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Step I: Subtract the minutes. 55 – 40 = quarter-hour Step II: Subtract hours. 8 – 6 = 2 hours |
 Ans: 2 hours quarter-hour |
2. Subtract 10 hours 50 minutes from 12 hours 45 minutes.
 Ans: 1 hour 55 minutes |
Step I: We can’t 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 below minutes. Step III: 12 – 1 = 11 hours stay in hours Step IV: Subtract hours. 11 – 10 = 1 hour Step V: Write 1 below hours. |
Questions and Solutions on Including and Subtracting Time:
I. Add the next.
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II: Subtract the next.
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