View Full Version : .9 repeating equals 1?


[a-5]
01-03-08, 06:46 PM
http://polymathematics.typepad.com/polymath/2006/06/no_im_sorry_it_.html



That's trippy. I disagree.

Asguard
01-03-08, 07:09 PM
you do realise that didnt prove anything. His conclusion is right .9recuring is concidered to be 1 but that doesnt mean his maths is but if you want a really trippy example try this

1/9 = 0.1 recuring
2/9 = 0.2 recuring
3/9 = 0.3 recuring
4/9 = 0.4 recuring
5/9 = 0.5 recuring
6/9 = 0.6 recuring
7/9 = 0.7 recuring
8/9 = 0.8 recuring

so if we follow the patten then
9/9 = 0.9 recuring

but it doesnt it equals 1

Klippymitch
01-03-08, 09:24 PM
My favorite math problem ever.

I love this one.

Oh yeah

.999... does not equal 1.

Asguard
01-03-08, 09:37 PM
try this one same sum written different way

4/9 + 5/9 = what? (they are ment to be fractions not divisions BTW)

or

0.4 recuring + 0.5 recuring = what?

thats where the problem lies but if you just accept what he said then

0.4 recuring would equal 0.5 and 0.5 recuring would equal 0.6 which would give a total of 1.1

or better still

0.1 recuring equals 0.2 so 9*0.1 recuring would equal 1.8 which is clearly wrong

[a-5]
01-03-08, 11:06 PM
I suck at math, I just found the article =/

Asguard
01-03-08, 11:09 PM
4/9 + 5/9 = 9/9 = 1 (any number divided by itself =1)

0.4 recuring + 0.5 recuring = 0.9 recuring

mapsdnasggeyerg
01-04-08, 10:40 AM
or better still

0.1 recuring equals 0.2 so 9*0.1 recuring would equal 1.8 which is clearly wrong

.1 recurring would only equal .2 if there were no real number between them. Obviously there are an infinite number of real numbers between them.

No doubt this thread will soon be locked as...


This topic (0.999...=1) has been discussed to death here (http://www.sciforums.com/showthread.php?t=55487), here (http://www.sciforums.com/showthread.php?t=69222), and elsewhere.

Spud Emperor
01-04-08, 10:48 AM
So we're quivelling about 0.00000000....some number about to appear not so soon...etc?

There are some infinetissimal grey areas in maths.
Get a life guys!

BenTheMan
01-04-08, 10:49 AM
Thank you DH.

a-5, asguard and klippy are all wrong.

If you want to discuss this, check out the PAGES of discussion in one of the other threads.

No doubt this thread will soon be locked as...

Don't mind if I do...

James R
01-04-08, 09:04 PM
I'd just like to add for the benefit of mapsdnasqqeyerg that nobody claims that .1 recurring equals .2.