Added: 1 year ago
From: khanacademy
Views: 21,638
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  • 78 divided by 0.15 = 520 :)

  • I'm a college graduate many years past; this has been a nagging issue for me for sometime. Your explanation was perfect. I'm feeling whole now. Thank you for your kind assistance. :)

  • Comment removed

  • this is just the same question as tutorial one, I wish you would do something different

  • I need to now like 15% of 64 is what?

  • @TheTony024 sorry i meant to write you put 3 over 20 not 5 over 20.because you choose a number that 15 and 100 go evenly into.so lets say 5. 5 goes into 15 3 times and goes into 100 20 times.so that would be 3 over 20.sorry about my mistake.i hope you get what i,m trying to say.(i,m not suggesting your stupid)

  • @TheTony024 then you divide the number your looking for 15% of by the bottom number so say your looking for 15% of 750 you would divide 750 by 20 and x the answer by 5.this is a method for finding the percentage of a number you have already got.(NOT what the guy is showing here),this method is only good if you know your times tables.

  • U make it look easy

  • @TheTony024 theres a much easier way of doing it if you know your times tables,so you write the percent your looking for ie 15% you write 15 over 100 ie you put 15 a line below it then 100.then you think of a number that goes into both evanly so 5 goes into 15 3 times and 5 goes into 100 20 times.(so that put simpaley is 5x3=15 and 5 x 20=100)then you write 5 over 20 then keep doing it as long as it will let you until you have a simple fraction.i am running out of characters i will continue.

  • awsome tutorial...broken down very well

  • This doctor I work w/ does all the calculations in his head. He did it to figure out how much Dilantin a patient would need when it was at a lower than average number in her blood.

    He went through a labyrinth of calculations doing them all in his head until he arrived at the proper dose that would make up the difference.

    I was stunned and thought "No wonder I didn't get into Pre-med.'

    I don't see how ANYONE can be comfortable doing that in his head. Especially when medication doses are involved.

  • @vickiormindyb

    that's kinda bad, if he fucks up, then hes messing with lives of patients.

  • logical, easy, clean presentation. Thanks

  • Thank u so much for saving me all that money on tutors!! ur the best

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