math-mode
Given A, B, C any string or maths code, given + any operation of my choice, I would like to display a really simple calculation – here addition. On below the result I would like to obtain :
A
+B
__
C
I can't do it here, but please see the underline as right under B (not my above ugly displaying). A, B and C should be aligned. The operator is displayed on the left of B.
Actually, I am wondering if there is a package for that, to perform this simply ?
the xlop package does this sort of thing. It does warn that it uses "french conventions", but at least for multiplication it looks fine, to me.
disclaimer: i last did multiplication sums in school in the 1950s...
\documentclass{article}
\usepackage{xlop}
\begin{document}
\opmul{384}{56}\qquad
\end{document}
This can be done using an array:
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\[
\renewcommand\arraystretch{1.2}
\begin{array}{c@{}c@{\,}c@{\,}c@{\,}c@{\,}ccl}
& \makebox[0pt]{\raisebox{-.5\normalbaselineskip}[0pt][0pt]{$\times$}} & & 1 & 2 & 3 \\
& & & 4 & 5 & 6 \\
\cline{3-6}
& & & 7 & 3 & 8 & & \text{(this is $123 \times 6$.)} \\
+& & 6 & 1 & 5 & & & \text{(this is $123 \times 5$, shifted one position to the left.)} \\
& 4 & 9 & 2 & & & & \text{(this is $123 \times 4$, shifted one position to the left.)} \\
\cline{1-6}
& 5 & 6 & 0 & 8 & 8
\end{array}
\]
\end{document}
With the arydshln package one can get the double dashed line above the result:
\documentclass{article}
\usepackage{amsmath}
\usepackage{arydshln}
\setlength\dashlinedash{5pt}
\setlength\dashlinegap{2.5pt}
\begin{document}
\[
\renewcommand\arraystretch{1.2}
\begin{array}{c@{}c@{\,}c@{\,}c@{\,}c@{\,}ccl}
& \makebox[0pt]{\raisebox{-.5\normalbaselineskip}[0pt][0pt]{$\times$}} & & 1 & 2 & 3 \\
& & & 4 & 5 & 6 \\
\cline{3-6}
& & & 7 & 3 & 8 & & \text{(this is $123 \times 6$.)} \\
+& & 6 & 1 & 5 & & & \text{(this is $123 \times 5$, shifted one position to the left.)} \\
& 4 & 9 & 2 & & & & \text{(this is $123 \times 4$, shifted one position to the left.)} \\
\cdashline{1-6}\\[-1.09\normalbaselineskip]\cdashline{1-6}
& 5 & 6 & 0 & 8 & 8
\end{array}
\]
\end{document}
Best Answer
What you can do is use the
tabularenvironment:By using the
Scolumn of thesiunitxpackage, you are able to set everything accordingly to their value (unidades, decenas, centenas, etc.)Now, regarding the line... I'm sorry, but I don't know what is the best approach. The result of the code mentioned above is:
I just realized that you could use
\hlineor\bottomruleif using thebooktabspackage and get something decent:This would be the result: