Add:

63.05, 24.839, 3.7, 16.85

Maximum number of decimal places in given decimals is 3. So, we convert them into like decimals, each having 3 places of decimal, by annexing zeros.

Thus, we get: 63.050, 24.839, 3.700 and 16.850

On adding column-wise, we get:

$\begin{array}{r} 63.050 \ 24.839 \ 3.700 \ +\phantom{0}16.850 \ \hline 108.439 \ \hline \end{array}$

Hence, the sum is 108.439