\documentclass{article}
\usepackage{automultiplechoice}
\usepackage{fp}
\begin{document}

\scoringDefaultM{mz=2}

\begin{examcopy}
  \begin{questionmult}{positive}
    Which numbers are positive?
    \begin{choices}
      \wrongchoice{-1}
      \wrongchoice{0}
      \correctchoice{1}
      \correctchoice{$\pi$}
    \end{choices}
  \end{questionmult}

  \begin{questionmultx}{add}
    How much are 2 plus 2?
    \AMCnumericChoices{4}{scoreexact=2,scoreapprox=1,digits=2,decimals=0,significant=true,sign=true}
  \end{questionmultx}
\end{examcopy}

\end{document}
