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  • Subject: Question about math (case closed)
Subject: Question about math (case closed)

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So I have 18.54885775
Should I round it to 18.6 or 18.5?

It's .04885775 away from 18.5, or .05114225 away from 18.6

So while it's obviously closer to 18.5, why am I told to round it to 18.6?

-edit-
In this case I need to round to the tenths

-edit2-
thanks for helping me out Flood

[Edited on 01.08.2013 12:21 AM PST]

  • 01.08.2013 12:07 AM PDT
Subject: Question about math

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Depends on how many significant figures/decimal places you want to round to.

  • 01.08.2013 12:08 AM PDT

"There's a very fine line between not listening, and not caring. I'd like to think that I walk that line every day."

18.55


I've always done hundredths.

  • 01.08.2013 12:08 AM PDT
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Numbers make my thinker box hurt

  • 01.08.2013 12:08 AM PDT

18.5

  • 01.08.2013 12:08 AM PDT

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Posted by: BROWN HAWK
18.55


I've always done hundredths.
I also like rounding it to the hundredths, but in this case it needs to be rounded to the tenths.

  • 01.08.2013 12:09 AM PDT

"There's a very fine line between not listening, and not caring. I'd like to think that I walk that line every day."

Posted by: PandaJerk007
Posted by: BROWN HAWK
18.55


I've always done hundredths.
I also like rounding it to the hundredths, but in this case it needs to be rounded to the tenths.
Well, I think '5' is supposed to be rounded up, so following in sequence, .55 would go to .6?

  • 01.08.2013 12:09 AM PDT

<3

The reason whoever told you to round it to 18.6 is because they think 18.548 rounds to 18.55 which round to 18.6 but that's wrong.

It should either stop at 18.55 or round down to 18.5 You can't keep rounding forever.

It's like rounding 18.48 to 18.5 then rounding that to 19.

It was closer to 18 than it was to 19 so that makes no sense.

  • 01.08.2013 12:11 AM PDT

"There's a very fine line between not listening, and not caring. I'd like to think that I walk that line every day."

Posted by: Toxifies
The reason whoever told you to round it to 18.6 is because they think 18.548 rounds to 18.55 which round to 18.6 but that's wrong.

It should either stop at 18.55 or round down to 18.5 You can't keep rounding forever.

It's like rounding 18.48 to 18.5 then rounding that to 19.

It was closer to 18 than it was to 19 so that makes no sense.
Kill 'em with logic.

  • 01.08.2013 12:12 AM PDT

"You can't touch music, but music can touch you."

I've been told in most of my math classes to use two decimal places. You would end up with 18.55 because the 8 in the thousandths place causes the 4 in the hundredths place to round up to 5.

  • 01.08.2013 12:15 AM PDT

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Posted by: Toxifies
The reason whoever told you to round it to 18.6 is because they think 18.548 rounds to 18.55 which round to 18.6 but that's wrong.

It should either stop at 18.55 or round down to 18.5 You can't keep rounding forever.

It's like rounding 18.48 to 18.5 then rounding that to 19.

It was closer to 18 than it was to 19 so that makes no sense.
Okay thanks, that's more or less what I was thinking.
I hate second guessing myself, but I do it all the time because rounding hasn't been taught to me clearly enough.

-edit-
so yeah, thanks guys for helping teach me <3

[Edited on 01.08.2013 12:19 AM PST]

  • 01.08.2013 12:16 AM PDT