Addition and Subtraction of Time - Orchids The International School
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Time

Addition and Subtraction of Time

The steps to add times are the following:

  • Arrange the times in the column according to the hours, minutes, and seconds.
  • Add the seconds. If the seconds are more than 60 then subtract 60 from it and add 1 to the minute.
  • Add the minutes. If the minutes are more than 60 then subtract 60 from it and add 1 to the hour.
  • Add the hours.

Example:

Add 5 h 20 minutes 54 seconds and 2 hours 12 minutes 12 seconds.

Solution:

Step 1: Arrange both the times column-wise.

Step 2: Add 54 seconds and 12 seconds. The sum is 66 seconds which is more than 60.

Step 3: Subtract 60 from the sum 66. Write the difference 6 in the second column and add 1 to the minute’s column.

Step 4: Add 20 minutes, 12 minutes, and 1 minute. Write the sum 33 in the minute’s column.

Step 5: Add 5 hours and 2 hours. Write the sum 7 hours in the hour’s column.

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  • Sometimes hour may also end up to large.
  • If the hour is more than 24 then subtract 24 from it and add 1 day.

Subtraction of time

The steps to subtract times are the following:

  • Arrange the time in the column according to the hours, minutes, and seconds.
  • Subtract the seconds. If the second’s value in the minuend is smaller than the value in the subtrahend then borrows 1 minute (60 seconds) from the minute’s column.
  • Subtract the minutes. If the minute’s value in the minuend is smaller than the value in the subtrahend then borrows 1 hour (60 minutes) from the hour’s column.
  • Subtract the hours.

Example:

Subtract 3 h 12 minutes 48 seconds from 5 hours 20 minutes 12 seconds.

Solution:

Step 1: Subtract 48 seconds from 12 seconds. Since 48 > 12. Borrow 1 minute (60 seconds) from the minute’s column.

Step 2: Now subtract 48 from (60 + 12) = 72 seconds. Write the difference in 24 seconds in the second column.

Step 3: Subtract 12 minutes from 19 minutes. Write the difference 7 minutes in the minute’s column.

Step 4: Subtract 3 hours from 5 hours. Write the difference of 2 hours in the hour’s column.

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Elapsed Time

Elapsed time is defined as the total time that has passed from the starting time to the ending time.

Steps to find the elapsed time:

  • Note the start time.
  • Note the end time.
  • Subtract the start time from the end time.

Example:

Write the time elapsed for the given pair of clocks:

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Solution:

The time on the first clock is 1: 10

The time on the second clock is 8:20

Time elapsed is equal to the difference between 8 hours 20 minutes and 1 hour 10 min.

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Did you know?

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