Use addition and subtraction in
finding time interval
Addition
Example
Add: 4 hours 30 minutes and 2 hours 45
minutes
75 minutes = 1 hour 15
minutes
7 Hour 15 minutes
Example
Krishna goes to his village. He travels 4 hours
35 minutes in bus and 1 hour 55 minutes in two wheeler. What is his total time
of travel?
∴
Kirshna travels totally for 6 hour 30 minutes
90 minutes = 60+30 minutes
60 minutes = 1 hour
30 minutes = 30 minutes
∴ 5+1 = 6 hour 30 minutes
Subtraction
Example
Subtract : 3 hours 45 minutes from 5
hours 30 minutes
We can’t Subtract 45
minutes from 5 hours 30 minutes so we change the 5 hours in to (60 + 30) 90
minutes and subtract 45 minutes from 90 minutes. We can get 45 minutes.
When we subtract 3 hours
from 4 hours balance is 1 hour
Example
Ram works on his Computer from morning
10' O Clock to Evening 3.30. How long does he work on his computer?
Ram work on his Computer at Evening = 3
Hours 30 Minutes
His work at Morning = 10 Hours 00
Minutes
Subtract from a.m. to
p.m., we add 12 hours.
Add 3.30 hours + 12 hours
we can get 15:30
∴
Ram works 5 hours 30 minutes on his computer
Example
1. Find the time interval between First bell and morning break.
The time interval between First bell and
morning break is 2 Hours.
2. Find the time interval between the time of class starting and
the time of morning break.
The time interval between class starting
time and morning break ending time is 1 hour 40
minutes.
We can’t subtract 30 minutes from 10 minutes so we convert to hour into minutes 1 hours to 60 minutes and add.
60+10 = 70 now we subtract 30 minutes from 40 we can get 1 hour 40 minutes.
3. Find the total time from starting of morning class to Closing
of Afternoon class.
Add 12 hours, 4.10 + 12.00
= 16 Hours + 10 minutes
The total time from starting of morning
class to closing of afternoon class is 6 hours 40
minutes.
Try this
Find the time interval between starting of afternoon class and closing of evening class.
Subtract from am to pm, we
add 12 hours and then subtract the a.m time.
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