## Chemistry: The Central Science (13th Edition)

When considering significant figures, it is important to realize that non-zero numbers are significant figures. However, zeroes that do not have non-zero digits behind them are not significant figures. This becomes apparent using scientific notation: $.033=3.3*10^(-2)$ $.0033=3.3*10^(-3)$ Converting into scientific notation makes in clear that zeroes located in front of all of the non-zero digits are not significant. Therefore, each number contains two significant figures.