## Identifying significant figures

In order to tell how many significant figures there are in a number, follow these basic rules.

Rule 1 | Significant figures are the number of digits from the “first nonzero” to the “last position”. |
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Rule 2 | The “Last Position” is the last number’s position if the measurement has a decimal point. Otherwise, the “last position” is the last non-zero’s position. |

Now try them out.

Repeatedly enter a number and check how many significant figures it has:

**Acknowledgement: **Thanks to Larry Battle for the code and help.

Next step: Interactive Quiz