# What Is Significant Figures?

## Answer

Significant figures of a number are the digits that we can confidently say we know have meaning in an answer, or a measurement. If we measure something in millimeters on a ruler and find it to be a little over 1mm, we can estimate how much over it is, but only the 1 mm is significant. You can find more information here: http://chemed.chem.purdue.edu/genchem/topicreview/bp/ch1/sigfigs.html
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Significant figures or digits of a measured number are the digits that indicate how precise it is.
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