I want to make something like this with MathJax:
1 2 4
+ 5 3
------
1 7 7
How would I go about doing so? I searched on the TeX website, but people only gave answers with stuff like ${\$\$}$\begin{tabular}{cccc}$$, which only works for LaTeX, and not MathJax. Is there a way to render the above equation in MathJax, and how?
One could use the array environment:
$$
\begin{array}{r}
&124\\
+\!\!\!\!\!\!&53\\
\hline
&177
\end{array}
$$
$\LaTeX$ source:
\begin{array}{r}
&124\\
+\!\!\!\!\!\!&53\\
\hline
&177
\end{array}
Using only one column and adding some (positive) space after the plus is better than using negative space to fiddle with the two column spacing, in my opinion. I think the other version will fail in native MathML mode in firefox, for example, as it doesn't handle negative space very well.
\begin{array}{r} 124\\ +\quad 53\\ \hline 177 \end{array}
If you don't like "array", there is also "align" $$\begin{align} 124& \\ \underline{+\quad 53}& \\ 177& \end{align}$$
$$\begin{align} 124& \\ \underline{+\quad 53}& \\ 177& \end{align}$$
