xlop – Calculates and displays arithmetic operations

Xlop (eX­tra Large OPer­a­tion) will type­set arith­metic prob­lems ei­ther in-line or “as in school” (us­ing French school con­ven­tions). So for ex­am­ple, \opadd{2}{3} can give ei­ther $2+3=5$ or some­thing sim­i­lar to: \be­gin{tab­u­lar}{r} 2\\ +3\\ \hline 5\end{tab­u­lar}.
Fur­ther­more, num­bers may be very large, e.g 200 fig­ures (with a very long com­pi­la­tion time). Many other fea­tures al­low to deal with num­bers (tests, dis­play, some high level op­er­a­tions, etc.)