Math Question: What does it mean, if a number has a "line" on top of it?

[ndee]

Like 7.08 but on the 8, there is a "-" on top of it. What does that mean?

 

[Stojakapimp]

that the 8 goes on forever, like 7.08888888888

 

[ndee]

Originally posted by: Stojakapimp
that the 8 goes on forever, like 7.08888888888

Ah ok. Thanks! The question is, I have to write 7.08888888888... as a breach, how would I do that? 0.8... == 8/9, right?

 

[cirthix]

high school freshman? with that many posts WOW

 

[ndee]

Originally posted by: cirthix
high school freshman? with that many posts WOW

nope, I just have to refresh my math stuff cuz I really suck at math. That's why I need to work everything up.

 

[TheLonelyPhoenix]

Originally posted by: ndee

Originally posted by: Stojakapimp
that the 8 goes on forever, like 7.08888888888

Ah ok. Thanks! The question is, I have to write 7.08888888888... as a breach, how would I do that? 0.8... == 8/9, right?

wtf is a breach?

If that means "fraction", then yes, you would write it as 7 8/9 or 71/9.

 

[So]

Originally posted by: ndee

Originally posted by: cirthix
high school freshman? with that many posts WOW

nope, I just have to refresh my math stuff cuz I really suck at math. That's why I need to work everything up.

Wow. Seriously, that is like 7th grade math, if that high level. You really do suck at math. 😀

Originally posted by: ndee

Originally posted by: Stojakapimp
that the 8 goes on forever, like 7.08888888888

Ah ok. Thanks! The question is, I have to write 7.08888888888... as a breach, how would I do that? 0.8... == 8/9, right?

'a breach'

you mean a fraction? 😕

 

[ndee]

Originally posted by: TheLonelyPhoenix

Originally posted by: ndee

Originally posted by: Stojakapimp
that the 8 goes on forever, like 7.08888888888

Ah ok. Thanks! The question is, I have to write 7.08888888888... as a breach, how would I do that? 0.8... == 8/9, right?

wtf is a breach?

If that means "fraction", then yes, you would write it as 7 8/9 or 71/9.

ah yes, a fraction, I just translated it in my online dictionary. But how would you write 7.0888888... as a fraction? I know that 0.08 = 8/100 but 0.08(the 8 with a line on it), I have no idea. I have the solution(319/45) but I don't know how to get there, nor do I know how to search for it cuz I don't know how that line is exactly called.

 

[So]

Originally posted by: ndee

Originally posted by: TheLonelyPhoenix

Originally posted by: ndee

Originally posted by: Stojakapimp
that the 8 goes on forever, like 7.08888888888

Ah ok. Thanks! The question is, I have to write 7.08888888888... as a breach, how would I do that? 0.8... == 8/9, right?

wtf is a breach?

If that means "fraction", then yes, you would write it as 7 8/9 or 71/9.

ah yes, a fraction, I just translated it in my online dictionary. But how would you write 7.0888888... as a fraction? I know that 0.08 = 8/100 but 0.08(the 8 with a line on it), I have no idea. I have the solution(319/45) but I don't know how to get there, nor do I know how to search for it cuz I don't know how that line is exactly called.

Yes, the error in the above post is that while .8... = 8/9, .08... != 8/9

 

[ndee]

Originally posted by: So

Originally posted by: ndee

Originally posted by: TheLonelyPhoenix

Originally posted by: ndee

Originally posted by: Stojakapimp
that the 8 goes on forever, like 7.08888888888

Ah ok. Thanks! The question is, I have to write 7.08888888888... as a breach, how would I do that? 0.8... == 8/9, right?

wtf is a breach?

If that means "fraction", then yes, you would write it as 7 8/9 or 71/9.

ah yes, a fraction, I just translated it in my online dictionary. But how would you write 7.0888888... as a fraction? I know that 0.08 = 8/100 but 0.08(the 8 with a line on it), I have no idea. I have the solution(319/45) but I don't know how to get there, nor do I know how to search for it cuz I don't know how that line is exactly called.

Yes, the error in the above post is that while .8... = 8/9, .08... != 8/9

I know, I just wanted to check if I got the 8/9 stuff right 🙂

 

[So]

Okay, taking the given answer, and windows calculator, we see that 7*45 = 315 and (319-315)/45 = 4/45 = .08...

 

[So]

As for how to take .08.... and convert to 4/45? I can't really remember. Most of these (like 8/9) you just kinda know. For more obscure ones, I use my ti-83 or 89 😀

 

[ndee]

Originally posted by: So
Okay, taking the given answer, and windows calculator, we see that 7*45 = 315 and (319-315)/45 = 4/45 = .08...

Yes, I can take a calculator but then, I still don't understand how to get to the x/45 part. Do I just have to try? Or how can I get from 0.08888888... to 4/45?

 

[ndee]

Originally posted by: So
As for how to take .08.... and convert to 4/45? I can't really remember. Most of these (like 8/9) you just kinda know. For more obscure ones, I use my ti-83 or 89 😀

ah ok. Me too but I want to find that out 😀

 

[So]

I think you can do some sort of infinite series, but that wouldn't make anyone happy.

 

[ndee]

Originally posted by: So
I think you can do some sort of infinite series, but that wouldn't make anyone happy.

It's called "Periodic Line" in German, now I know what to look for 😀 Thanks anyway!


Found it: you just multiply it by 10 until there are no more commas in the number, like 0.8/9 = 8/90 😀

But now I have another problem, because 0.8 != 0.8... oh well, I will find a solution anyway 🙂 Found it again 😀

 

[Chronoshock]

Yeah you can either just look to see if its something you know thats been scaled or shifted (ie 1/9 -> 1/90 for example) or you can use perturbation:
x = .08888888...
10x = .8888888...
9x = .8
x = 8/90
This works well with all repeating patterns, you just need to do something different for the second term
so for example,
x = .0143143143143...
1000x = 14.3143143143...
999x = 14.3
x = 143/9990

 

[ndee]

Originally posted by: Chronoshock
Yeah you can either just look to see if its something you know thats been scaled or shifted (ie 1/9 -> 1/90 for example) or you can use perturbation:
x = .08888888...
10x = .8888888...
9x = .8
x = 8/90
This works well with all repeating patterns, you just need to do something different for the second term
so for example,
x = .0143143143143...
1000x = 14.3143143143...
999x = 14.3
x = 143/9990

Thanks dude! Makes sense 😀