\(\huge\frac{2}{5}\)

\(\begin{aligned}\require{cancel}
0.4&=\large\frac{4}{10}&&\color{blue}{\text{Say four tenths.}}\\
\\
&=\large\frac{\cancel4^\color{red}2}{\cancel{10}_\color{red}5}&&\color{blue}{\text{Simplify. Divide the numerator and}}\\
& &&\color{blue}{\text{denominator by the GCF, 2.}}\\
&=\large\frac{2}{5} \\
\end{aligned} \)

\(\huge\frac{16}{25}\)

\(\begin{aligned}\require{cancel}
0.64&=\large\frac{64}{100}&&\color{blue}{\text{Say sixty-four hundredths.}}\\
\\
&=\large\frac{\cancel{64}^\color{red}{16}}{\cancel{100}_\color{red}{25}}&&\color{blue}{\text{Simplify. Divide the numerator and }}\\
& &&\color{blue}{\text{denominator by the GCF, 4.}}\\
&=\large\frac{16}{25} \\
\end{aligned} \)

\(\huge2\frac{3}{4}\)

\(\begin{aligned}\require{cancel}
2.75&=2\large\frac{75}{100}&&\color{blue}{\text{Say two and seventy-five hundredths.}}\\
\\
&=2\large\frac{\cancel{75}^\color{red}{3}}{\cancel{100}_\color{red}{4}}&&\color{blue}{\text{Simplify. Divide the numerator and }}\\
& &&\color{blue}{\text{denominator by the GCF, 25.}}\\
&=2\large\frac{3}{4} \\
\end{aligned} \)

0.36

3.5

3.2

\(3\cfrac{1}{5}=\cfrac{16}{5}\)