$\frac{3}{8}=0,375\approx 0,38$
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}3\\ \phantom{0}\underset{¯}{0}\\ \underset{¯}{\phantom{0}}30\\ \phantom{0}\underset{¯}{24}\\ \phantom{0}\underset{¯}{\phantom{0}}60\\ \phantom{00}\underset{¯}{56}\\ \phantom{00}\underset{¯}{\phantom{0}}40\\ \phantom{000}\underset{¯}{40}\\ \phantom{0000}0\end{array}& \begin{array}{l}\overline{)8}\\ \overline{\overline{)\mathrm{0,375}}}\end{array}\end{array}$

$\frac{8}{15}=0,5(3)\approx 0,53$
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}8\\ \phantom{0}\underset{¯}{0}\\ \underset{¯}{\phantom{0}}80\\ \phantom{0}\underset{¯}{75}\\ \phantom{0}\underset{¯}{\phantom{0}}50\\ \phantom{00}\underset{¯}{45}\\ \phantom{00}\underset{¯}{\phantom{0}}50\\ \phantom{000}\underset{¯}{45}\\ \phantom{0000}5\text{...}\end{array}& \begin{array}{l}\overline{)15}\\ \overline{\overline{)\mathrm{0,533...}}}\end{array}\end{array}$

$1\frac{6}{7}=1,(857142)\approx 1,86$
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}6\\ \phantom{0}\underset{¯}{0}\\ \underset{¯}{\phantom{0}}60\\ \phantom{0}\underset{¯}{56}\\ \phantom{0}\underset{¯}{\phantom{0}}40\\ \phantom{00}\underset{¯}{35}\\ \phantom{00}\underset{¯}{\phantom{0}}50\\ \phantom{000}\underset{¯}{49}\\ \phantom{000}\underset{¯}{\phantom{0}}10\\ \phantom{00000}\underset{¯}{7}\\ \phantom{0000}\underset{¯}{\phantom{0}}30\\ \phantom{00000}\underset{¯}{28}\\ \phantom{00000}\underset{¯}{\phantom{0}}20\\ \phantom{000000}\underset{¯}{14}\\ \phantom{000000}\underset{¯}{\phantom{0}}60\\ \phantom{0000000}\underset{¯}{56}\\ \phantom{00000000}4\text{...}\end{array}& \begin{array}{l}\overline{)7}\\ \overline{\overline{)\mathrm{0,8571428...}}}\end{array}\end{array}$

$3\frac{8}{21}=3,(380952)\approx 3,38$
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}8\\ \phantom{0}\underset{¯}{0}\\ \underset{¯}{\phantom{0}}80\\ \phantom{0}\underset{¯}{63}\\ \underset{¯}{\phantom{0}}170\\ \phantom{0}\underset{¯}{168}\\ \phantom{00}\underset{¯}{\phantom{0}}20\\ \phantom{0000}\underset{¯}{0}\\ \phantom{00}\underset{¯}{\phantom{0}}200\\ \phantom{000}\underset{¯}{189}\\ \phantom{000}\underset{¯}{\phantom{0}}110\\ \phantom{0000}\underset{¯}{105}\\ \phantom{00000}\underset{¯}{\phantom{0}}50\\ \phantom{000000}\underset{¯}{42}\\ \phantom{000000}\underset{¯}{\phantom{0}}80\\ \phantom{0000000}\underset{¯}{63}\\ \phantom{0000000}17\text{...}\end{array}& \begin{array}{l}\overline{)21}\\ \overline{\overline{)\mathrm{0,3809523...}}}\end{array}\end{array}$