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☖ Forums → Discussion Forum → Does 0.999 repeating equal 1?
123456
Does 0.999 repeating equal 1?
2007-03-09, 7:32 PM #1
As part of an ongoing study to see how stupid Massassi is, I frequently post these polls and note how their results change over time.

You must explain your answer.
Bassoon, n. A brazen instrument into which a fool blows out his brains.
2007-03-09, 7:33 PM #2
Oh boy.
[http://img.photobucket.com/albums/v308/Echoness101/ugh.jpg]
SnailIracing:n(500tpostshpereline)pants
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2007-03-09, 7:40 PM #3
I used to have an equasion somewhere that I saw on TV which proved .9... = 1. I lost the equasion.
I had a blog. It sucked.
2007-03-09, 7:42 PM #4
You mean like this: 1/3 + 2/3 = .9999(repeating) = 1
SnailIracing:n(500tpostshpereline)pants
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2007-03-09, 7:43 PM #5
I don't know. I don't care.

o.0
2007-03-09, 7:46 PM #6
I think the correct answer is Yes but I voted I don't know because I don't really care. Blame Greenboy.
幻術
2007-03-09, 7:46 PM #7
Originally posted by Echoman:
You mean like this: 1/3 + 2/3 = .9999(repeating) = 1

No, it involved some multiplication and stuff, I'll go look for the paper and see if I still have it hidden somewhere.
I had a blog. It sucked.
2007-03-09, 7:53 PM #8
There are many ways to prove that .999... = 1. My personal favorite is the equation for a geometric series.
Ban Jin!
Nobody really needs work when you have awesome. - xhuxus
2007-03-09, 8:08 PM #9
no, if .9999999... truly is .9999999.... then it does not = 1... it is .9999999... unless you add .1111111... or unless your not dealing with absolutes.
Welcome to the douchebag club. We'd give you some cookies, but some douche ate all of them. -Rob
2007-03-09, 8:09 PM #10
Originally posted by Darth_Alran:
no, if .9999999... truly is .9999999.... then it does not = 1... it is .9999999... unless you add .1111111... or unless your not dealing with absolutes.


:downs:
2007-03-09, 8:11 PM #11
Originally posted by Rob:
:downs:


my sentiments exactly :P
Welcome to the douchebag club. We'd give you some cookies, but some douche ate all of them. -Rob
2007-03-09, 8:12 PM #12
Atleast you admit to having downs.
2007-03-09, 8:13 PM #13
Next up, the plane-on-a-conveyor-belt question. Oh I can't wait! :neckbeard:
Stuff
2007-03-09, 8:15 PM #14
How about the diamond car crashing into a diamond wall question?
SnailIracing:n(500tpostshpereline)pants
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2007-03-09, 8:16 PM #15
Oooh I haven't seen that one before.
Stuff
2007-03-09, 8:18 PM #16
It goes something like this. It's dumb, I know:

"What would happen if a car made of diamonds (the hardest natural material) goes fullspeed into a wall made of diamond (again the hardest natural material)?"
SnailIracing:n(500tpostshpereline)pants
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2007-03-09, 8:19 PM #17
The answer: Vin Diesel .
幻術
2007-03-09, 8:25 PM #18
Originally posted by kyle90:
Next up, the plane-on-a-conveyor-belt question. Oh I can't wait! :neckbeard:

I'm packing for school, so please, do post a poll on that one!
Bassoon, n. A brazen instrument into which a fool blows out his brains.
2007-03-09, 8:27 PM #19
I'd say that both the car and the wall will shatter. But if there's not enough kinetic energy to do that, the car will bounce off the wall (assuming it's anchored sufficiently well) in a very good approximation of a perfectly elastic collision.

I'm not sure what there even is to debate about this one :confused:

EDIT: ^^^ Okay!
Stuff
2007-03-09, 8:27 PM #20
Originally posted by Echoman:
It goes something like this. It's dumb, I know:

"What would happen if a car made of diamonds (the hardest natural material) goes fullspeed into a wall made of diamond (again the hardest natural material)?"

That question is at least a bit more reasonable. I could see how you would answer it incorrectly.

Both the car and the wall would shatter into thousands of pieces. Diamond is hard, but it is not strong.

Here's a way to think about it. Glass is much harder than steel. What happens if a car made of glass goes full speed into a wall made of glass?
Bassoon, n. A brazen instrument into which a fool blows out his brains.
2007-03-09, 8:30 PM #21
It actually would depend on alot of things..

Like how the diamond was arranged, the thickness of the car and the wall.

Etc.


That doesn't make it not a stupid question to aks. It's about as smart as when a three year old asks something like "How many miles in the world?"
2007-03-09, 8:44 PM #22
Yes.

0.9 repeating = 1

Why?

Let x = 0.999...

Equation (1): 10x = 9.999...
Equation (2): x = 0.999...

Subtract eq (2) from eq (1) to get:

9x = 9

Hence,

x = 1.
2007-03-09, 9:22 PM #23
.999 repeating does not exist. It's not a number; it's an anomaly in our number system and not an actual representation of any quantity or mathematical constant.

Furthermore, if you do allow for repeating decimals to exist as an approximation for the fractional values unrepresentable by a number system, then .999 repeating must equal 1 in order for our current definition of mathematics to remain consistent.
"Well, if I am not drunk, I am mad, but I trust I can behave like a gentleman in either
condition."... G. K. Chesterton

“questions are a burden to others; answers a prison for oneself”
2007-03-09, 9:24 PM #24
Originally posted by West Wind:
.999 repeating does not exist. It's not a number;

Numbers don't exist either. You have no point at all...

By the way... it is a number. :downs:
"it is time to get a credit card to complete my financial independance" — Tibby, Aug. 2009
2007-03-09, 9:25 PM #25
OBVIOUSLY IF .333333333 REPEATING IS ONE THIRD THEN IF YOU TIMES THAT BY 3 YOU GET .999999999 REPEATING SO OBVIOUSLY IT IS 1

DUHH
2007-03-09, 9:47 PM #26
No, but it's damn close.
omnia mea mecum porto
2007-03-09, 10:05 PM #27
yes

Who moved my roman legate? :hist101:
2007-03-09, 10:21 PM #28
.999 repeating does not equal 1 because Jesus made it so.
ᵗʰᵉᵇˢᵍ๒ᵍᵐᵃᶥᶫ∙ᶜᵒᵐ
ᴸᶥᵛᵉ ᴼᵑ ᴬᵈᵃᵐ
2007-03-09, 10:23 PM #29
0.999... repeating gets infinitely closer to one for an infnite amount of time.
So in theory yes.
2007-03-09, 10:34 PM #30
Holy ****, TE is smarter than we all thought!
"it is time to get a credit card to complete my financial independance" — Tibby, Aug. 2009
2007-03-09, 10:41 PM #31
Freelancer, he made a thread about a year ago asking this very question. People spent 3 pages explaining it to him.

I also made a thread, and I'm still oblivious to the concepts. Numbers are wasted on me.
ᵗʰᵉᵇˢᵍ๒ᵍᵐᵃᶥᶫ∙ᶜᵒᵐ
ᴸᶥᵛᵉ ᴼᵑ ᴬᵈᵃᵐ
2007-03-09, 10:53 PM #32
I still lawl at how many people get this wrong.
2007-03-09, 11:35 PM #33
Originally posted by Echoman:
It goes something like this. It's dumb, I know:

"What would happen if a car made of diamonds (the hardest natural material) goes fullspeed into a wall made of diamond (again the hardest natural material)?"


Actually, I believe diamond was referred to as "the hardest metal known to man"
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2007-03-09, 11:39 PM #34
Well, it's an annoying matter to me. Like, I can see how 0.999999999~ can round up to 1 but as that itself it can't be 1.

Just like the final second of 2004 wasn't 2005.

Or something.

I voted "I don't know" yet "I don't care" would be more accurate.
Star Wars: TODOA | DXN - Deus Ex: Nihilum
2007-03-09, 11:42 PM #35
Originally posted by Alan:
Actually, I believe diamond was referred to as "the hardest metal known to man"

Metal, what?
Bassoon, n. A brazen instrument into which a fool blows out his brains.
2007-03-09, 11:45 PM #36
Yeah, diamond definitely isn't metal, and besides, we've made stuff that's harder than diamonds. :P
Stuff
2007-03-09, 11:45 PM #37
Quote:
Like, I can see how 0.999999999~ can round up to 1


Wow, you must be talented. Please do tell us how you add an extra 9 onto the end of an infinite number of 9s.
"it is time to get a credit card to complete my financial independance" — Tibby, Aug. 2009
2007-03-09, 11:48 PM #38
Why don't you ease up there, chief?
Bassoon, n. A brazen instrument into which a fool blows out his brains.
2007-03-09, 11:50 PM #39
Originally posted by Emon:
Metal, what?

There was a forum in which people were debating whether or not a car made of diamond "(one of the hardest, if not THE hardest metal known to man)" would kill a brick wall on impact. Someone screenshotted it and posted on 4chan, and there were some lolz.

There's an image macro of it somewhere out there.
error; function{getsig} returns 'null'
2007-03-09, 11:50 PM #40
Why should I? It's not like this is some sort of essay question where there's no wrong answer.
"it is time to get a credit card to complete my financial independance" — Tibby, Aug. 2009
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