Convert the following fraction into decimal.

$\frac{3}{12}$

Convert the following fraction into decimal.

$\frac{15}{30}$

Convert the following fractions into decimals.

$1\frac{1}{50}$

Write the following decimals in descending order as well as in ascending order.

$\mathrm{7.025,} \mathrm{7.520,} \mathrm{7.205,} 7.502$

Write the following decimals in descending order as well as in ascending order.

$13.67, 1.367, 136.7, 1367.0$

Add the following:

$0.1+11.40$

Add the following:

$9.85+0.619$

Add the following:

$16.21+162.1$

Subtract the following:

$6-4.75$