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:
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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
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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
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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
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2. Add 5 weeks 4 days and 4 weeks 5 days
Solution:
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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 2 days Carry 1 to week column and write 2 in days column.
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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:
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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
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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:
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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.
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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
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Ans: 2 hours 15 minutes
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2. Subtract 10 hours 50 minutes from 12 hours 45 minutes.
Ans: 1 hour 55 minutes
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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.
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Questions and Answers on Adding and Subtracting Time:
I. Add the following.
1.
|
Hours
|
Minutes
|
|
30
|
20
|
+
|
20
|
05
|
|
2.
|
Hours
|
Minutes
|
|
45
|
48
|
+
|
10
|
12
|
|
3.
|
Days
|
Hours
|
|
33
|
20
|
+
|
45
|
14
|
+
|
50
|
16
|
|
4.
|
Weeks
|
Days
|
|
32
|
4
|
+
|
10
|
6
|
+
|
48
|
5
|
|
5.
|
Hours
|
Minutes
|
Seconds
|
|
17
|
42
|
30
|
+
|
12
|
36
|
20
|
+
|
15
|
50
|
50
|
|
6.
|
Years
|
Months
|
|
56
|
10
|
+
|
43
|
05
|
+
|
17
|
11
|
|
II: Subtract the following.
1.
|
Hours
|
Minutes
|
Seconds
|
|
16
|
30
|
20
|
-
|
15
|
20
|
50
|
|
2.
|
Hours
|
Minutes
|
Seconds
|
|
13
|
23
|
43
|
-
|
10
|
22
|
32
|
|
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