# What is the LaTeX code for this mathematical expression?

Welcome to TeX.SX! This is a simple answer, however, you should check the commands and packages specifically for the addition / multiplication / etc. on TeX.SX.

\documentclass{article}
\begin{document}
$\begin{array}{rr} A & B \\ +\ 3 & 7 \\ \hline 9 & A \end{array}$
\end{document}


• (+1) for using the delimeters ;) – Raaja Dec 3 '18 at 9:45
• In the original question, the $A\ B$ in the first line were right of the other two lines. I suspect (supported by the acceptance) that was not required. +1. – Ross Millikan Dec 4 '18 at 4:30
• @Raaja: presumably the delimiters you mention are the square brackets. I haven't seen them. What do they do? – Ross Millikan Dec 4 '18 at 4:31
• @RossMillikan Well, here what I mean by delimeter is that using a \\ instead of a not-so-nice tab space using &. – Raaja Dec 4 '18 at 6:49

I would do:

\documentclass{article}
\begin{document}
\begin{tabular}{ccc}&$A$&$B$\\ +&$3$&$7$\\ \hline&$9$&$A$
\end{tabular}\end{center}
\end{document}


Another approach with xlop:

\documentclass[12pt]{article}
\usepackage{xlop}
\begin{document}
\oplput(1,2){A}\oplput(2,2){B}
\oplput(0,1.5){$+$}
\oplput(1,1){3}\oplput(2,1){7}
\ophline(0,0.8){4}
\oplput(1,0){9}\oplput(2,0){A}
\end{document}


To show also the solution you only need add some like \vspace{1em}\opadd{59}{37}

• I think 58+37=95 is the solution of the addition, not 59+37 :) – JouleV Dec 3 '18 at 13:23
• @DũngVũ With or without taking the last carry? Because then A=5+1 and 59+37 is correct ... Ok, it was just messing, really it was only a typo... ;) – Fran Dec 3 '18 at 14:27