\documentclass[frontgrid,letterpaper,12pt]{flacards}
% \usepackage[scaled=0.85]{beramono}
\usepackage{color}
\usepackage{etoolbox}
\pretocmd{\card}{\def\curhint{#1}}{}{}
\pagesetup{3}{6}
\usepackage{xeCJK}
% \setCJKmainfont{AR PL UKai CN}
\setmainfont{Linux Libertine O}
% \setmainfont{mono}
% \setmainfont{BitStream Vera Mono}
\renewcommand{\cardtextstylef}{\Huge}
\renewcommand{\cardtextstyleb}{\small}
\renewcommand{\frfoot}{Addition: 1 thru 9}
\renewcommand{\brfoot}{}
% Temporarily disable new lines when displaying the riddle on the back
\renewcommand{\bcfoot}{\let\\\relax\footnotesize\curhint}
% \renewcommand{\blfoot}{\footnotesize chris}
% \renewcommand{\blfoot}{\footnotesize Ashley}
% \renewcommand{\blfoot}{\footnotesize Casandra}
% \renewcommand{\blfoot}{\footnotesize Jessica}
\renewcommand{\flhead}{\footnotesize\thecardno}
\renewcommand{\brhead}{\footnotesize\thecardno}
\begin{document}
\card{1+1}{2}
\card{1+2}{3}
\card{1+3}{4}
\card{1+4}{5}
\card{1+5}{6}
\card{1+6}{7}
\card{1+7}{8}
\card{1+8}{9}
\card{1+9}{10}
\card{2+1}{3}
\card{2+2}{4}
\card{2+3}{5}
\card{2+4}{6}
\card{2+5}{7}
\card{2+6}{8}
\card{2+7}{9}
\card{2+8}{10}
\card{2+9}{11}
\card{3+1}{4}
\card{3+2}{5}
\card{3+3}{6}
\card{3+4}{7}
\card{3+5}{8}
\card{3+6}{9}
\card{3+7}{10}
\card{3+8}{11}
\card{3+9}{12}
\card{4+1}{5}
\card{4+2}{6}
\card{4+3}{7}
\card{4+4}{8}
\card{4+5}{9}
\card{4+6}{10}
\card{4+7}{11}
\card{4+8}{12}
\card{4+9}{13}
\card{5+1}{6}
\card{5+2}{7}
\card{5+3}{8}
\card{5+4}{9}
\card{5+5}{10}
\card{5+6}{11}
\card{5+7}{12}
\card{5+8}{13}
\card{5+9}{14}
\card{6+1}{7}
\card{6+2}{8}
\card{6+3}{9}
\card{6+4}{10}
\card{6+5}{11}
\card{6+6}{12}
\card{6+7}{13}
\card{6+8}{14}
\card{6+9}{15}
\card{7+1}{8}
\card{7+2}{9}
\card{7+3}{10}
\card{7+4}{11}
\card{7+5}{12}
\card{7+6}{13}
\card{7+7}{14}
\card{7+8}{15}
\card{7+9}{16}
\card{8+1}{9}
\card{8+2}{10}
\card{8+3}{11}
\card{8+4}{12}
\card{8+5}{13}
\card{8+6}{14}
\card{8+7}{15}
\card{8+8}{16}
\card{8+9}{17}
\card{9+1}{10}
\card{9+2}{11}
\card{9+3}{12}
\card{9+4}{13}
\card{9+5}{14}
\card{9+6}{15}
\card{9+7}{16}
\card{9+8}{17}
\card{9+9}{18}
\end{document}
