Mental Math Posted January 27, 2012 Share Posted January 27, 2012 (edited) Here is a cool trick to add hours and minutes together: Let's try adding 3 hr 23 minutes and 2 hr 46 minutes together. Make the 3 hr 23 minutes into one number, which will give us 323 and do the same for the other number, 2 hours 46 minutes, giving us 246. Now add these two numbers together: 323 246 569 So, we have a total of 569. Now, if the last 2 digit is equal to or greater than 60, just add 40 to the total, otherwise keep it as it is. 569 + 40 = 609 And now, split the number to get the answer which is 6 hrs and 09 minutes! Edited January 27, 2012 by swansont remove url Link to comment Share on other sites More sharing options...
DrRocket Posted January 27, 2012 Share Posted January 27, 2012 Here is a cool trick to add hours and minutes together: Let's try adding 3 hr 23 minutes and 2 hr 46 minutes together. Make the 3 hr 23 minutes into one number, which will give us 323 and do the same for the other number, 2 hours 46 minutes, giving us 246. Now add these two numbers together: 323 246 569 So, we have a total of 569. Now, if the last 2 digit is equal to or greater than 60, just add 40 to the total, otherwise keep it as it is. 569 + 40 = 609 And now, split the number to get the answer which is 6 hrs and 09 minutes! Mental Math With Tricks & Shortcuts Isn't rather a lot easier to just note that 46 minutes + 23 minutes = 1 hour and 9 minutes, do the remaining 3 + 2 quickly in your head, and go have a beer ? Link to comment Share on other sites More sharing options...
swansont Posted January 27, 2012 Share Posted January 27, 2012 ! Moderator Note Rule 7 says, in part: Advertising and spam is prohibited. We don't mind if you put a link to your noncommercial site (e.g. a blog) in your signature and/or profile, but don't go around making threads to advertise it. Link to comment Share on other sites More sharing options...
khaled Posted January 28, 2012 Share Posted January 28, 2012 I'd think about modulus 60 in modular arithmetic, or to make seconds & minutes in Base 60 ... Link to comment Share on other sites More sharing options...
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