What's the best way to round a double to 12 decimals?

What's the best way to do it? The math functions don't seem quite right...

I'm doing three different algoritms that are mathematically identical. I'm working with precisions from 2 to 12 significants digits (working with a function I got from a book), but the results are no exctly what I expect... For example, the one with 12 significant digits is 97.45322134230000001, or something like that... I'm making a method that receiving a double and an n makes a string with the correct number of significant digits... However, rounding the double beforehand would come in handy.

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Crop marks are needed to trim the page to size when printed. As printers can't print right to edge of a sheet, and that it's near impossible to trim a sheet of paper right to the edge of a colour - the colour needs to extend past the crop line, this is called bleed.
When you bleed the document, i.e., extend any item that is tucked right against the foredge (the edges opposite the spine), then you need to extend this object off the page into a "bleed" area.
This allows for human error when trimming the paper, as each sheet is not trimmed individually (that would take forever!) they are stacked on top of each other and trimmed in stacks. It would be impossible to stack all the sheets exactly even, and there is movement on the press, so compensating for the movement and the fact they can never be stacked exactly even - for this reason you need objects to extend past the edge of the page.
The crop marks tell the guillotine operator where to trim the sheet. Once they have the measurements in their guillotine machine it's a simple matter of rinse and repeat with as many stacks of paper there are.
And printers can sometimes fold and trim a print job folding machine, and since it's a machine and you have to account for mechanical errors and human error, you need bleed too.
Bleed is important - If you don't add bleed then the object stops at the foredge of the paper. And if the blade trims/crops close to the object but misses by a sliver - then you have a sliver of white on the printed piece, which is highly undesirable.
So you need crop marks so the printers know where exactly to cut the paper, and to cut into the bleed so that you don't have slivers of white.
And yes you need crop marks even if you don't have bleed, if you don't have any bleed it's likely that the edges of the paper are just white, so there are no markings where to cut to give the correct size that you want. So crop marks need to be included no matter what.
And the placement of crop marks is important. As I said earlier, crop marks are for letting the guillotine operator know where to trim the page so that it cuts into the bleed area. The bleed area to allow for mechanical, physical and human error. And seen as the bleed can sometimes be included in a final printed piece it is not desirable to have anything other than bleed objects in the bleed area.
For this reason you offset your crop marks to be outside the bleed area. As I'm in Europe I work mainly in millimeters, so I would set my Bleed Area to be 3-5 mm (check with your printers for what bleed you should allow) and I would set my crop marks to Offset by 1 mm more than the Bleed (i.e., 4 - 6mm).
This ensures that the crop marks do not encroach the bleed area. If your crop marks do encroach the bleed area you run the risk of the crop marks appearing on a final printed piece.
So in Summary
Make sure you have bleed where necessary on your document.
Add the desired amount of bleed - in my case 3-5 mm.
Offset the crop marks so they don't encroach the bleed area - in my case 4-6mm.
(bleed depends on the printers requirements - then make sure you offset your crop marks to be outside the bleed area).
Message was edited by: Eugene Tyson
Correction to mm in Summary

What's the best way to deal with floating point errors?

What's the best way to deal with the decimal number errors in Flex?
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var number1:Number = 1.1;
var number2:Number = 1;
var result:Number = number1 - number2;
trace(result);
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I think there really should be a pre-built method in flex for something like this, but I can't find any.
Anyone know any better/faster ways?

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What's the best way to round a double to 12 decimals?

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