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The JavaScript FAQ
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Question: How do I round a number to n decimal places?

Answer: You can use the following code to round a number:

Math.round(10*X)/10;     // round to tenths
Math.round(100*X)/100;   // round to hundredths
Math.round(1000*X)/1000; // round to thousandths
... Copyright © 1999-2006, Alexei Kourbatov

The JavaScript FAQ
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  Mirrored with kind permission of Alexei Kourbatov Design by Interspire