Add the following decimals
$$23.7, 106.94, 68.9$$ and $$29.5$$
converting the given decimals into like decimals, we get
$$23.70, 106.94,68.90$$ and $$29.50$$
Now writing these decimals in column form and adding , we get
$$ \therefore $$ The sum of the given decimals is $$229.04$$