> See also:
> - Reference
# Significant Figures
> ## Always Significant
> - **Nonzero Digits**
> - **Captive Zeros**
> - *Zeros between multiple significant figures.*
> - **Trailing Zeros**
> - *When they are to the right of a decimal point.*
> - *When in scientific notation.*
> ## Never Significant
> - **Leading Zeros**
> - **Trailing Zeros**
> - *When they are to the left of the decimal point.*
### Calculating With Significant Figures
> ###### Addition/Subtraction
> aaa
> ###### Multiplication/Division
> aaa
> ###### Rounding
> aaa