Page 137 - Maths Class 05

Step 3 : Add the minutes column.
Hours Minutes Seconds
42 minutes + 12 minutes 9 42 30

= 54 minutes + 18 12 18

Step 4 : Now add hours column.
27 hrs. 54 min. 48 sec.
9 hours + 18 hours

= 27 hours

We get the answer as 27 hours 54 minutes 48 seconds.

Addition of Hours, Minutes and Seconds (with carry over)

Example : Add 10 hours 45 minutes 36 seconds and 6 hours 30 minutes 40

seconds.
Solution : Step 1 : Write hours, minutes and seconds columnwise.

Step 2 : Add seconds column.
Hours Minutes Seconds
36 seconds + 40 seconds 1 1
10 45 36
= 76 seconds = 1 minute
+ 6 30 40
16 seconds.
17 hr 16 min 1 sec6
Step 3 : Add minutes column.

45 minutes + 30 minutes + 1 minute = 76 minutes

We know 60 minutes = 1 hour
So, we split 76 minutes = (60 + 16) minutes = 1 hour 16

minutes
Step 4 : Now, add hours column.

10 hours + 6 hours + 1 hour = 17 hours

We get, 17 hours 16 minutes 16 seconds.

Practice - 7.1
Practice - 7.1
Practice - 7.1
Practice - 7.1
1. Fill in the missing numbers.

a. Hours Minutes Seconds b. Hours Minutes Seconds
13 6 20 10

+ 15 31 51 + 35
30 59 15 55 37

Mathematics-5 137