Use addition and subtraction in finding time interval

__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.

Tags : Time | Term 1 Chapter 5 | 5th Maths , 5th Maths : Term 1 Unit 5 : Time

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5th Maths : Term 1 Unit 5 : Time : Use addition and subtraction in finding time interval | Time | Term 1 Chapter 5 | 5th Maths

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