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# Metric System  Metric conversions  Accuracy Precision Dimensional Analysis Scientific Notation  Significant Figures  Significant Figures in Calculations Rounding using Significant Figures Density

 Rules for Significant Figures

## Version Number 1

```Rule #1: All non-zero digits are significant.

Rule #2: Zeros in front of a number are not significant.

Rule #3: Zeros between non-zero digits are significant.

Rule #4: Zeros at the end of a number are significant if there is a decimal point in the number.```
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## Version Number 2

Use this diagram to help determine the number of significant figures in a measured value…

Pacific                          Atlantic

If the decimal point is present, start counting digits from the Pacific (left) side,

starting with the first non-zero digit.

 0.0031 (4 sig. figs.)

If the decimal point is absent, start counting digits from the Atlantic (right) side,

starting with the first non-zero digit.

 31,400 ( 3 sig. figs.)

Examples