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adding time - magic formula funda

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adding time - magic formula funda [#permalink] New post 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] New post 16 Feb 2010, 23:42
Expert's post
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] New post 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] New post 17 Feb 2010, 12:41
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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] New post 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] New post 18 Feb 2010, 07:10
nice... thanks for this cool tip!
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Re: adding time - magic formula funda [#permalink] New post 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] New post 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] New post 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] New post 19 Feb 2010, 20:55
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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   [#permalink] 19 Feb 2010, 20:55
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