Adding and Subtracting Time
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
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
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4th Grade Math Activities
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