Here, we are to arrange in columns and perform the given arithmetic operations
We proceed as follows;
1. 0.2314 + 0.405 + 0.02123 + 0.0021
[tex]\begin{gathered} 0.23140 \\ 0.40500 \\ 0.02123 \\ 0.00210 \\ \ldots\ldots\ldots\ldots\ldots \\ 0.65973 \\ .................... \end{gathered}[/tex]