$\frac{3}{7}=$

Perform a written division. Since you want to round the result to three digits, you have to compute (at least) four digits.

$=0.4285\dots$

Now, round to three digits (up).

$\approx0.429$

$\frac{8}{13}=$

Perform a written division. Since you want to round the result to three digits, you have to compute (at least) four digits.

$=0.6153\dots$

Now, round to three digits (down).

$\approx0.615$

$\frac{5}{3}=$

Perform a written division. Since you want to round the result to three digits, you have to compute (at least) four digits.

$=1.6666\dots$

Now, round to three digits (up).

$\approx1.667$

$\frac{2}{7}=$

Perform a written division. Since you want to round the result to three digits, you have to compute (at least) four digits.

$=0.2857\dots$

Now, round to three digits (up).

$=0.286$

$\frac3{11}=$

Perform a written division. Since you want to round the result to three digits, you have to compute (at least) four digits.

$=0.2727\dots$

Now, round to three digits (up).

$\approx0.273$

$\frac{13}{11}=$

Perform a written division. Since you want to round the result to three digits, you have to compute (at least) four digits.

$=1.1818\dots$

Now, round to three digits (up).

$\approx1.182$