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How do you round an answer up to 3 significant figures ?

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sherryseah | Student, Grade 9 | Salutatorian

Posted June 3, 2012 at 3:12 PM via web

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How do you round an answer up to 3 significant figures ?

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justaguide | College Teacher | (Level 2) Distinguished Educator

Posted June 3, 2012 at 3:21 PM (Answer #1)

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To round off an answer to 3 significant figures look at the fourth figure after the decimal point.

xxx.xxxC

If C is greater than or equal to 5, increase the third digit after the decimal point by 1 while eliminating C, else eliminate C without making a change in the third digit after the decimal point.

As an illustration: 23.0145 would be rounded off to 23.015 while 23.0144 would be rounded off to 23.014

Once this is done, the number has been rounded off to 3 significant figures.

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