TeX source:

\begin{aligned} (0.\underbrace{01}_{\color{blue}{\text{2 places}}})  (0.\underbrace{004}_{\color{blue}{\text{3 places}}}) &= 0.\underbrace{00004}_{\color{blue}{\text{5 places}}} \\ \left(\frac{1}{100}\right)\left(\frac{4}{1000}\right) & =\frac{4}{100,000} \end{aligned}