Math Proof: 0.99999... = 1 !

Tags:: Math Proof Equals One Reason Amazin Cool Tricks N-dru Malta Algebra

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The mathematical reasoning behind this equation. All done by simple algebra! Original music. And YES there is a 'typo' involving decimal places and all that, but keep in mind that this is about 0.9 RECURRING!

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14 Comments | Add Comment

hahaha lol
lol it should be 0.99999 instead of 0.9999 after 63 seconds lol you did it wrong..
By PatrickP93 1199538280 Reply Spam [+0] Moderate Up Moderate Down Remove ~~6549076~~
- READ the video description...
  the number of 9s doesn't matter, it's a representation of 0.9 recurring!
  By n-dru 1199541541 Reply Spam [-1] Moderate Up Moderate Down Remove ~~7337995~~
sorry not correct
the right answer is x=0.99999
10x=9.9999
10x-x = 9x = 9.9999-0.99999 = 8.99991 so x =0.99999 again
we can trick maths :)
By spym 1199366497 Reply Spam [+0] Moderate Up Moderate Down Remove ~~3732610~~
- You are right he is not correct however
  Any digit less than 9 would have to be after an infinite number of 9's.
  By Reed.... 1199408418 Reply Spam [-1] Moderate Up Moderate Down Remove ~~6738239~~
- Totally Correct - 0.9 recurring!!
  Guys it's just a typo- as die_trying said: it's an infinite number of decimal places!!
  
  Please note that i couldn't type the symbol for 'recurring' [a dot above the recurring number]. I just put in loads of nines to give you the idea!
  By n-dru 1199366740 Reply Spam [-1] Moderate Up Moderate Down Remove ~~7337995~~
Let 'x' be equal to 0.999999 (recurring)
The rest is easy!
By n-dru 1199358565 Reply Spam [+0] Moderate Up Moderate Down Remove ~~7337995~~
Put it this way:
0.33333.... = 1/3
0.33333.... x 3 = 1/3 x 3
0.99999.... = 1
By n-dru 1199408756 Reply Spam [-1] Moderate Up Moderate Down Remove ~~7337995~~
In mathematics...
"the recurring decimal 0.999â€¦ , which is also written as 0.ar{9} , 0.dot{9} or 0.(9), denotes a real number equal to 1. In other words, "0.999â€¦" represents the same number as the symbol "1". The equality has long been accepted by professional mathematicians and taught in textbooks"
By n-dru 1199408683 Reply Spam [-1] Moderate Up Moderate Down Remove ~~7337995~~
It still is not 1
It is 1 minus a number smaller than any you can imagine, it isn't zero but its as close to zero as possible.
By Reed.... 1199408244 Reply Spam [-1] Moderate Up Moderate Down Remove ~~6738239~~
- This proof is correct!
  Search anywhere on the web!
  
  What is being proved is that 0.9 recurring (that is 0.9 with an INFINITE number of decimal places) is mathematically equal to 1
  By n-dru 1199408453 Reply Spam [-1] Moderate Up Moderate Down Remove ~~7337995~~
Sorry Do it again
9.9999-0.99999 does not equal 9.0000 there fore your proof does not work!!!
Ans.= 8.99991
By Chazz707 1199366044 Reply Spam [-1] Moderate Up Moderate Down Remove ~~2754745~~
- ok
  im guessing that was a typo- providing you use the same number of decimal places- technically the proof works
  By die_trying 1199366512 Reply Spam [+0] Moderate Up Moderate Down Remove ~~4264429~~
- Yes of course
  it's a typo, glad you had enough reason to point it out, thanks!
  By n-dru 1199366771 Reply Spam [-1] Moderate Up Moderate Down Remove ~~7337995~~
- Ever heard of 0.9 recurring?
  Okay so maybe i missed a 9, it's not the point! i just put in a couple of 9s to give you the basic idea...
  By n-dru 1199366306 Reply Spam [-1] Moderate Up Moderate Down Remove ~~7337995~~

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