Tabular column not matching up

Question

I'm trying to create a document showing how two numbers are added, focusing on moving from the ones column on up, but for some reason, my tabular environment's columns are not matching up with my actual input. I've declared three columns, yet my second declaration is adjusting my third column.

\begin{center}
\begin{tabular}{rp{1cm} rp{1cm} rp{1cm} }
2{\color{red}{2}} &  & {\color{red}{2}}2 \\
+1{\color{red}{3}} & $\longrightarrow$ & +{\color{red}{1}}3 \\
\cline{1-1} \cline{3-3}
{\color{red}{5}} & & {\color{red}{3}}5
\end{tabular}
\end{center}

I'm trying to use the right arrow to show how we move from the ones column to the tens, so I figured I'd just assign it its own column. Yet the spacing is a little off, and when I try to turn the second rp{1cm} into c{1cm}, it messes up my third column. What's even weirder is that the \cline command places the line in the right place...

Answer 1

You have six column specifications, but using three, the first and third are right justified, the column in the middle centered:

\documentclass{article}
\usepackage{color}
\begin{document}
\begin{center}
\begin{tabular}{rcr}
2\textcolor{red}{2} & & \textcolor{red}{2}2 \\
+1\textcolor{red}{3} & $\longrightarrow$ & +\textcolor{red}{1}3 \\
\cline{1-1} \cline{3-3}
\textcolor{red}{5} & & \textcolor{red}{3}5
\end{tabular}
\end{center}
\end{document}

This yields (image added by azetina):

The difference {\color{red}{...}} to \textcolor{red}{...} does not matter, I have only used \textcolor because it is easier to read (less braces).