Trick for Adding Time

Have you ever faced any problem in adding time?

If you have ever have faced the slightest difficulty in adding time or duration expressed in hours and minutes, this trick is meant for you.

Say you have to add 4 hours 55 minutes and 2 hours 40 minutes.

Make 4 hours 55 minutes into one number, which will give us 455 and do the same for the other number, 2 hours 40 minutes, giving us 240.

Shortcut Trick to Add Two Numbers

Simply add these two numbers together:

455

240

——

695

What you need to do is add 40 to the above result. No matter what the hours and minutes are, just add the constant 40 to the total obtained by adding the time in above manner.

695 + 40 = 735; this means 7 hours 35 minutes.

Be Careful

If there is no carryover from minutes to hours and the minutes digits are less than 60, don’t add 40. What you get after first step is your final answer. Say for example, if you have to add 2 hours 20 minutes and 3 hours 35 minutes:

220

335

——

555

So you straight away get your answer as 5 hours 55 minutes.

 

Another Illustration

Similarly, if someone is coming after 3 hours 55 minutes and right now the time is 1:35PM, you can use the above method to find the time of arrival.

355

135

—–

490

Adding 40 + 490, we get 530. Hence the person will arrive at 5:30PM.

 

More than two duration

This method can easily be extended for adding more than two time/duration.

So say for example, if you have to add 3 hours 40 minutes, 2 hours 25 minutes and 1 hour 55 minutes, we can do it like this:

340

225

155

——

720

Adding 40 twice to 720, we get 800. Hence, the answer is 8′o Clock.

For more information on math classes, consider looking into online universities

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