Members Marshredder Posted October 10, 2009 Members Share Posted October 10, 2009 I dont understand maths and that quote means nothing to me half of 3 is 1.5 to my simple mind Dont know how I got a B at GCSE. This was in Further Maths A level we were told, half of 3 is 1.5, but 3/2 is 1, because of the rule of significant figures. Quote Link to comment Share on other sites More sharing options...
Members -todgemistro- Posted October 10, 2009 Members Share Posted October 10, 2009 3/2 is the same as saying half of 3 isnt it? Quote Link to comment Share on other sites More sharing options...
Members satannica Posted October 10, 2009 Members Share Posted October 10, 2009 That was a good read.Weren't these silly equasions banded around by stoners in 1996? I seem to remember these stark relevations coming from similarly wide-eyed, open mouthed saucepan lids back in the day. Quote Link to comment Share on other sites More sharing options...
Members JBecker Posted October 11, 2009 Members Share Posted October 11, 2009 I dont understand maths and that quote means nothing to me half of 3 is 1.5 to my simple mind Dont know how I got a B at GCSE. This is an information issue. While 3/2 = 1.5, when we do math in science we never report more significant figures than exist in the number with the least significant figures in the operations. It ensure that we don't add a sense of higher accuracy which is a function of math rather than a function of precision of measurement.For example, if you have a scale that measures weight to the thousandths place, even though you can do math which results in digits beyond the thousandths place you don't report that or carry those digits into additional equations because we don't actually know what's happening at that level of accuracy.So yes, 3/2=1.5 but in some scenarios you won't report the answer to that level of accuracy. Quote Link to comment Share on other sites More sharing options...
Members Say Ocean Posted October 11, 2009 Members Share Posted October 11, 2009 How is 3/2 anything other than 1.5? It makes no sense to me It's for use in science. It's basically saying that 3 and 2 are both precise to the ones, so when dividing you give an answer that is precise to the ones because if you were to give it to the tenths it would imply a level of precision you do not have. Quote Link to comment Share on other sites More sharing options...
Members JBecker Posted October 11, 2009 Members Share Posted October 11, 2009 It's for use in science. It's basically saying that 3 and 2 are both precise to the ones, so when dividing you give an answer that is precise to the ones because if you were to give it to the tenths it would imply a level of precision you do not have.What we said. Quote Link to comment Share on other sites More sharing options...
Members Say Ocean Posted October 11, 2009 Members Share Posted October 11, 2009 What we said.Did not read the thread Quote Link to comment Share on other sites More sharing options...
Members guitarbilly74 Posted October 11, 2009 Members Share Posted October 11, 2009 That was a good read. Weren't these silly equasions banded around by stoners in 1996? I seem to remember these stark relevations coming from similarly wide-eyed, open mouthed saucepan lids back in the day. Quote Link to comment Share on other sites More sharing options...
Members LetsJet Posted October 11, 2009 Members Share Posted October 11, 2009 "3/2 is 1. Not 1.5, but 1. This is what I was actually taught by one of my maths teachers, who is a Dr of Particle Physics, you even get taught his theories if you do a doctorate in Physics, but yeah, 3/2 is 1, because you always give the answer to the same amount of decimal places." I understand the logic, but by my calculations 3/2 is 2, not 1. Because you would round up removing the decimal places. I believe your teachers logic is flawed as well as his math. People who are confused and want to understand - put the formula in an excel spreadsheet and change the number of decimal places to none. Here: Just make it 3.0/2.0 = 1.5 and tell your teacher you need to be more precise...lol Quote Link to comment Share on other sites More sharing options...
Members tbdmlog Posted October 11, 2009 Members Share Posted October 11, 2009 This thread is gonna make my head explode. I meant the head of my caulk. Quote Link to comment Share on other sites More sharing options...
Members -todgemistro- Posted October 11, 2009 Members Share Posted October 11, 2009 I'm far too tired to understand this {censored}. I probably still wont understand it when I wake up tomorrow though.. WHO WAS PHONE?! edit - oh if its a simple case of rounding up to a whole number then 3/2 would = 2 anyway, wouldn't it? Quote Link to comment Share on other sites More sharing options...
Members satannica Posted October 11, 2009 Members Share Posted October 11, 2009 This was in Further Maths A level we were told, half of 3 is 1.5, but 3/2 is 1, because of the rule of significant figures.Absolutley right!I did further maths too. Further Pure 3 left many a student crying in the corner like a little girl. Quote Link to comment Share on other sites More sharing options...
Members satannica Posted October 11, 2009 Members Share Posted October 11, 2009 I'm far too tired to understand this {censored}. I probably still wont understand it when I wake up tomorrow though.. WHO WAS PHONE?! edit - oh if its a simple case of rounding up to a whole number then 3/2 would = 2 anyway, wouldn't it? Decimal places are not the same as significant bits. Wiki it!Nobody was phone, the phone doesn't really exist. Don't try and speak to the phone, that's impossible. Instead, try to make the phone speak to you. Quote Link to comment Share on other sites More sharing options...
Members -todgemistro- Posted October 11, 2009 Members Share Posted October 11, 2009 Oh right. I do remember significant figures a bit from GCSEs but its all a blur. {censored} maths. I will continue doing my useless degree in blissful ignorance Quote Link to comment Share on other sites More sharing options...
Members MightyThor Posted October 11, 2009 Members Share Posted October 11, 2009 I remember my first toke. Quote Link to comment Share on other sites More sharing options...
Members teemuk Posted October 11, 2009 Members Share Posted October 11, 2009 3/2 is 1. Not 1.5, but 1. This is what I was actually taught by one of my maths teachers, who is a Dr of Particle Physics, you even get taught his theories if you do a doctorate in Physics, but yeah, 3/2 is 1, because you always give the answer to the same amount of decimal places.I was always taught that halfway values (.5) are rounded up but when I looked that up I found out that you can round them either up, to zero, half to even or stochastically. I.{censored}ing.Hate.Math. Quote Link to comment Share on other sites More sharing options...
Members Say Ocean Posted October 11, 2009 Members Share Posted October 11, 2009 I was always thought that halfway values (.5) are rounded up but when I looked that up I found out that you can round them either up, to zero, half to even or stochastically. I. {censored}ing. Hate. Math. My AP chem teacher taught us a way to round it up or down based on if the preceding number is even or something weird like that. The idea is that, statistically speaking, you will probably be rounding up and down equally and thus not end up exaggerating your number by constantly rounding up or down. Quote Link to comment Share on other sites More sharing options...
Members fatfat Posted October 11, 2009 Members Share Posted October 11, 2009 You guys are {censored}ing idiots. Quote Link to comment Share on other sites More sharing options...
Members fatfat Posted October 11, 2009 Members Share Posted October 11, 2009 My AP chem teacher taught us a way to round it up or down based on if the preceding number is even or something weird like that. The idea is that, statistically speaking, you will probably be rounding up and down equally and thus not end up exaggerating your number by constantly rounding up or down.There's different ways to do it. There's no "right" way. It depends on the context. Quote Link to comment Share on other sites More sharing options...
Members Say Ocean Posted October 11, 2009 Members Share Posted October 11, 2009 There's different ways to do it. There's no "right" way. It depends on the context.Yeah, I mean you can apply the basic concept in a number of ways. That was covered way at the beginning of the year though and succumbed in my memory to many more important concepts over the school year Quote Link to comment Share on other sites More sharing options...
Members MRscratch Posted October 11, 2009 Members Share Posted October 11, 2009 This is how .999_ = 1 x = .999_ 10x = 9.999_ 10x - x = (9.999_ - .999_) 9x = 9 x = 1 .999_ = 1 To further prove this, look at 3/3. .333_ = 1/3, and 3/3 = 1. Therefore, .999 = 1. Now, it can be argued that 1=2. 0 x 1 = 0 0 x 2 = 0 So than this must be true: 0 x 1 = 0 x 2 Similarly: 0/0 x 1 = 0/0 x 2 Simplified, 1 = 2 0=0why dont you try with addition0 plus 1 =10 plus 2 =20=0:idea: Quote Link to comment Share on other sites More sharing options...
Members MRscratch Posted October 11, 2009 Members Share Posted October 11, 2009 I remember my first toke.win Quote Link to comment Share on other sites More sharing options...
Members kayman121 Posted October 11, 2009 Members Share Posted October 11, 2009 This is how .999_ = 1 x = .999_ 10x = 9.999_ 10x - x = (9.999_ - .999_) 9x = 9 x = 1 .999_ = 1 To further prove this, look at 3/3. .333_ = 1/3, and 3/3 = 1. Therefore, .999 = 1. Now, it can be argued that 1=2. 0 x 1 = 0 0 x 2 = 0 So than this must be true: 0 x 1 = 0 x 2 Similarly: 0/0 x 1 = 0/0 x 2 Simplified, 1 = 2 Troll or remedial algebra failure. Quote Link to comment Share on other sites More sharing options...
Members kayman121 Posted October 11, 2009 Members Share Posted October 11, 2009 Stopped reading here Quote Link to comment Share on other sites More sharing options...
Members guitarbilly74 Posted October 11, 2009 Members Share Posted October 11, 2009 holy mother of FAIL I just re-read the OP.. dude any number x0 = 0 That does NOT prove all numbers are equal. It does a hell of a job proving you've been hitting that pipe hard though. I really do hope you have artistic talents or a glowing personality because math is not for you. Quote Link to comment Share on other sites More sharing options...
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