$\textcolor{ff6600}{4}\textcolor{660099}{3}+\textcolor{009999}{2}\textcolor{cc0000}{2}$

First add the 10s.

$\textcolor{ff6600}{4}0+\textcolor{009999}{2}0=60$

Now add the 1s of the first number.

$60+\textcolor{660099}{3}=63$

And now the 1s of the second number.

$63+\textcolor{cc0000}{2}=65$

$\textcolor{ff6600}{2}\textcolor{660099}{8}+\textcolor{009999}{5}\textcolor{cc0000}{3}$

First add the 10s.

$\textcolor{ff6600}{2}0+\textcolor{009999}{5}0=70$

Add the 1s of the first number.

$70+\textcolor{660099}{8}=78$

To do this, add the 1s of the second number.

$78+\textcolor{cc0000}{3}=81$

$\textcolor{ff6600}{1}\textcolor{660099}{7}+\textcolor{009999}{8}\textcolor{cc0000}{3}$

First add the 10s.

$\textcolor{ff6600}{1}0+\textcolor{009999}{8}0=90$

Add the 1s of the first number.

$90+\textcolor{660099}{7}=97$

To do this, add the 1s of the second number.

$97+\textcolor{cc0000}{3}=100$