We’ll discover ways to add and subtract time models.
1. Add 25 minutes 45 seconds and quarterhour 25 seconds.
Answer:
Add the seconds first 45 + 25 = 70 seconds Convert 70 seconds to minutes and seconds 70 seconds = 60 seconds + 10 seconds Transfer 1 minute to the minute column and kind 10 within the seconds column 
So 25 minutes 45 seconds + quarterhour 25 seconds = 41 minutes 10 seconds
3. Add 9 months 25 days 21 hours and seven months 20 days 13 hours.
Reply: 17 months 16 days 10 hours 
Step I: add hours 21 + 13 = 34 hours = 24 hours + 10 hours = 1 day 10 hours Step II: Write 10 below the hour and transfer 1 to days. Step III: Add the times. 1 + 25 + 20 = 46 days = 30 days + 16 days = 1 month 16 days Step IV: Write 16 below days and transfer 1 to months. Step V: add months one +9 +7 = 17 months summer season 17 below the moon 
2. Add 5 weeks 4 days and 4 weeks 5 days
Answer:
First day addition, 4 + 5 = 9 days Convert 9 days to weeks and days 9 days = 7 days + 2 days = 1 week and a pair of days Transfer 1 to the week column and write 2 to the day column. 
So 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 subtraction second Since we won’t subtract 29 from 15, we borrow 1 minute. So 15 + 60 = 75 seconds 75 – 29 = 46 seconds Write 46 within the seconds column Now subtract the minutes 23 – 18 = 5 minutes, write 5 within the minutes column 
Due to this fact, 24 minutes 15 seconds – 18 minutes 29 seconds = 5 minutes 46 seconds
4. Subtract 7 years 6 months from 8 years 3 months
Answer:
Subtract the months first We borrow and subtract 1 12 months, 16 – 6 = 9 months Kind 9 within the Months column and now subtract 7 – 7 = 0 Kind 0 within the Years column. 
So 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 = quarterhour Step II: Subtract the hours. 8 – 6 = 2 hours 
Reply: 2 hours quarterhour 
2. Subtract 10 hours 50 minutes from 12 hours 45 minutes.
Reply: 1 hour 55 minutes 
Step I: We will not subtract 50 minutes from 45 minutes. So borrow 1 hour from 12 hours. 1 hour = 60 minutes 60 + 45 = 105 minutes Step II: Subtract the minutes. 105 – 50 = 55 minutes Write 55 below the minute. Step III: 12 – 1 = 11 hours left as hours Step IV: Subtract the hours. 11 – 10 = 1 hour Step V: Write 1 below the clock. 
Time Addition and Subtraction Questions and Solutions:
I. Add the next.






II: Take away the next.


4th Grade Math Actions
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