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adding time - magic formula funda [#permalink ]
16 Feb 2010, 23:38
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here is a nice simple way to add hours and minutes together lets add 1hr & 35 mins and 3 hrs & 55mins together how to do it simple Take these two times as simple natural numbers like 135 and 355 Add them we get 135 + 355 = 490 Now add a constant number 40 to it: we get 490+ 40 = 530 so the time is 5 hrs and 30 mins simple.... Amazing but it always works:

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Re: adding time - magic funda [#permalink ]
16 Feb 2010, 23:42
Ha-ha. very cool. It works with 30 and 30 and 90 and 90.

Great tip!

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Re: adding time - magic formula funda [#permalink ]
17 Feb 2010, 12:05

Does this work only in an Hour + Min format? What if you had 90 minutes + 90 minutes?

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Re: adding time - magic formula funda [#permalink ]
17 Feb 2010, 12:41
mrturbo311 wrote:

Does this work only in an Hour + Min format? What if you had 90 minutes + 90 minutes?

You have to convert into hour format 90 = 1:30 = 130+130 = 260+40 = 300 or 3:00

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Re: adding time - magic formula funda [#permalink ]
18 Feb 2010, 00:19

ultimategoalmba wrote:

here is a nice simple way to add hours and minutes together lets add 1hr & 35 mins and 3 hrs & 55mins together how to do it simple Take these two times as simple natural numbers like 135 and 355 Add them we get 135 + 355 = 490 Now add a constant number 40 to it: we get 490+ 40 = 530 so the time is 5 hrs and 30 mins simple.... Amazing but it always works:

Cool!!! )) thank you! I think it is very useful and time saving trick.

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Re: adding time - magic formula funda [#permalink ]
18 Feb 2010, 07:10

nice... thanks for this cool tip!

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Re: adding time - magic formula funda [#permalink ]
18 Feb 2010, 11:10

What about 7 hours 30 minutes + 7 hours 00 minutes ? (730+700)+40=1470 How should we read 1470 ? Thank you very much in advance!

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Re: adding time - magic formula funda [#permalink ]
18 Feb 2010, 12:09

You probably don't need a formula for that one. Just add 7 hours + 7 hours + 30 minutes. It's much easier that way.

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Re: adding time - magic formula funda [#permalink ]
18 Feb 2010, 12:39
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But if I use this formula for something more complicated? Would this "a nice simple way to add hours and minutes together" amazingly always work? Maybe there are exceptions to the formula?

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Re: adding time - magic formula funda [#permalink ]
19 Feb 2010, 20:55
Yes, need a different formula - does not seem to work for 1:10 and 1:10 either, ends up 2:60

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Re: adding time - magic formula funda
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19 Feb 2010, 20:55