\documentclass[a4paper]{article}
\usepackage{fp}
\usepackage[calibration,indivanswers,ensemble]{automultiplechoice}
\begin{document}


\def\AMCntextGoto{\par{\bf\emph{Please code the result on the separate answer sheet.}}}

\element{grq}{
  \begin{questionmult}{sum}
\FPeval\VQa{trunc(1+random*8,0)}
\FPeval\VQb{trunc(4+random*5,0)}
\FPeval\VQsomme{clip(VQa+VQb)}

    How much are \VQa{} plus \VQb{}?

    \AMCnumericChoices{\VQsomme}{digits=2,Tsign={sign},strict=true}

  \end{questionmult}
}
\element{grq}{
  \begin{questionmultx}{product}
\FPeval\VQa{trunc(5+random*15,0)}
\FPeval\VQb{trunc(-5+random*10,0)}
\FPeval\VQprod{clip(VQa*VQb)}

    How much are \VQb{} times \VQa{} ?

    \AMCnumericChoices{\VQprod}{digits=4,approx=1}

  \end{questionmultx}
}
\element{grq}{
  \begin{questionmult}{sqrt}
\FPeval\VQa{trunc(5+random*15,0)}
\FPeval\VQs{VQa^0.5}

    Compute $\sqrt{\VQa}$.

    \AMCnumericChoices{\VQs}{digits=3,decimals=2,sign=false,borderwidth=0pt,backgroundcol=lightgray,approx=5}

  \end{questionmult}
}

\onecopy{5}{

  \begin{center}
    \bf\Large Questions
  \end{center}

\shufflegroup{grq}
\insertgroup{grq}

\clearpage \AMCformBegin

\begin{center}
  \bf\Large Answers...
\end{center}

\AMCform

}

\end{document}
