Addition of Hours, Minutes and Seconds

We will discuss here about the addition of hours, minutes and seconds.
Let us consider some of the examples on adding time.

Let us consider some examples:

1. Add 3 hr. 25 min. 15 sec. and 5 hr. 20 min. 25 sec.

Adding Time

We added hours, minutes and seconds respectively.


2. Add 5 hr. 45 min. 12 sec. and 7 hr. 50 min. 24 sec.

Addition of Hours, Minutes and Seconds

= 12 hr. 1 hr. + 35 min. + 36 sec.

= 13 hr. 35 min. 36 sec.

12 hr. 95 min. 36 sec.

= 12 hr. + (60 min. + 35 min.) + 36 sec.

= 12 hr. 1 hr. + 35 min. + 36 sec.

= 13 hr. 35 min. 36 sec.


3. Add 30 hr. 45 min. 45 sec. and 15 hr. 35 min. 17 sec.

Addition of Hours

= 45 hr. 1 hr. 20 min.  1 min. 11 sec.

= 46 hr. 21 min. 11 sec.

45 hr. 80 min. 71 sec.

= 45 hr. + (60 min. + 20 min.) + (60 sec. + 11 sec.)

= 45 hr. + 1 hr. + 20 min. + 1 min. + 11 sec.

= 46 hr. 21 min. 11 sec.


4. Add 24 hr. 30 min. 20 sec. and 18 hr. 37 min. 54 sec.

Addition of Hours and Minutes

= 42 hr. 1 hr. 7 min. 1 min. 14 sec.

= 43 hr. 8 min. 14 sec.

42 hr. 67 min. 74 sec.

= 42 hr. + (60 min. + 7 min.) + (60 sec. + 14 sec.)

= 42 hr. + 1 hr. + 7 min. + 1 min. + 11 sec. + 14 sec.

= 43 hr. 8 min. 14 sec.






4th Grade Math Activities

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