%\documentclass[12pt]{article}
\documentclass[12pt,a4paper,landscape]{article}
\usepackage{luacode}
\usepackage{caption}
\usepackage[margin=0pt]{geometry}%
\usepackage[table]{xcolor}
\usepackage{floatrow}
\floatsetup[table]{capposition=top}
\begin{luacode*}
function mymult(n)
for j = 1, 10, 1 do
for i = n-5+1, n do
tex.print(string.format('%d & $\\times$ & %d & = & %d ', i, j, (i * j)))
if i < n then
tex.print(' & ')
else
tex.print("\\\\\\hline")
end
end
end
end
\end{luacode*}
\newcommand{\mymult}[1]{\luadirect{mymult(#1)}}
\begin{document}
\begin{table}[t]
\rowcolors{2}{gray!18}{white}
\begin{tabular}{|r c r c r|r c r c r|r c r c r|r c r c r|r c r c r|}\hline
\rowcolor{gray!18}
\mymult{5}
\end{tabular}
\caption*{Multiplication tables for 1 to 5}
\end{table}
\begin{table}[t]
\rowcolors{2}{gray!18}{white}
\begin{tabular}{|r c r c r|r c r c r|r c r c r|r c r c r|r c r c r|}\hline
\rowcolor{gray!18}
\mymult{10}
\end{tabular}
\caption*{Multiplication tables for 6 to 10}
\end{table}
\end{document}
