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adding time - magic formula funda [#permalink]
 17 Feb 2010, 00:38
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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]
17 Feb 2010, 00:42
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, 13:05
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, 13:41
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, 01:19
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, 08:10
nice... thanks for this cool tip!
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Re: adding time - magic formula funda [#permalink]
18 Feb 2010, 12:10
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, 13:09
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, 13:39
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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, 21:55
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
[#permalink]
19 Feb 2010, 21:55
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