Question

Add:
$0.02,0.008$ and $0.309$

Answer 1

$0.02,0.008$ and $0.309$
$\begin{array}{cc}& 0.02\\ & 0.008\\ +& 0.309\\ & 0.337\end{array}$
So we get
$0.02+0.008+0.309=0.337$