\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
$$\begin{aligned}[t]4\text{ tens }+ \textcolor{colorprop}{13\text{ ones }} &= 4\text{ tens }+ \textcolor{colorprop}{1\text{ ten }+ 3\text{ ones }}\\ 4\text{ tens }+ 13\text{ ones } &= 5\text{ tens }+ 3\text{ ones }\\ \end{aligned}$$
\(\quad+ \quad \)\(\quad =\quad\)