Rounding \pgfmathprint to the right decimal place

Question

The following code works great for printing new input/output values on each build to PDF; but, I cannot get it to round to any decimal place. It always rounds to the nearest integer. I have tried \numprint and \sisetup approaches with no luck. Seems like a simple problem to solve; but, I have no luck deploying answers to similar questions on this forum. Ultimately, I'd like to be able to round to the right sig figs, and have even tried that with "round-places" and "round-figures" in whatever package those are part of...no luck.

\documentclass[12pt]{article}
\usepackage{geometry}
\geometry{margin=1in}
\usepackage{pgf,amsmath,enumitem,siunitx}

\pgfmathsetseed{\number\pdfrandomseed} % seed for pseudo random generator

% new command to initialize variables
\newcommand\initVariables{%
    \pgfmathsetmacro{\A}{random(100,200)}%
    \pgfmathsetmacro{\B}{random(5,29)}%
}
% define command to calculate result
%\newcommand\answer{\pgfmathprint{round(\A / \B)}} 
\newcommand\answer{\pgfmathprint{round(\A / \B)}} 

\begin{document}
\begin{enumerate}

\initVariables % initialize variables   
    \item \textbf{An object is displaced \A \ meters in \B \ seconds.}\\ 
    \begin{equation*}
        v = \dfrac{\Delta s}{\Delta t} = \dfrac{\A \ m}{\B \ s} =
        \pgfmathparse{\A / \B}\pgfmathresult \ \frac{m}{s}
        \approx \answer \frac{m}{s}\\
    \end{equation*}

Answer 1

The expl3 kernel has a better management for floating point numbers.

The \defineVariables macro sets (locally) what the variables should contain. With \initVariables the expressions are evaluated (so random integers are actually substituted).

In order to use the variable A, use \Var{A} (it's better than using \A and so on, you risk to redefine important commands). With

\round(<expression>,<places>)

the expression is evaluated and rounded at the stated number of decimal places.

\documentclass[12pt]{article}
\usepackage{geometry}
\geometry{margin=1in}
\usepackage{amsmath,enumitem,siunitx,xfp}


\ExplSyntaxOn
% no need to set the seed with expl3

% new command to initialize variables
\NewDocumentCommand{\defineVariables}{m}
 {
  \prop_set_from_keyval:Nn \l_clark_variables_def_prop { #1 }
 }
\NewDocumentCommand{\initVariables}{}
 {
  \prop_map_inline:Nn \l_clark_variables_def_prop
   {
    \prop_put:Nnx \l_clark_variables_set_prop { ##1 } { \fp_eval:n { ##2 } }
   }
 }
\NewExpandableDocumentCommand{\Var}{m}
 {
  \prop_item:Nn \l_clark_variables_set_prop { #1 }
 }
\NewExpandableDocumentCommand{\round}{mm}
 {
  \fp_eval:n { round(#1,#2) }
 }
\prop_new:N \l_clark_variables_def_prop
\prop_new:N \l_clark_variables_set_prop
\ExplSyntaxOff

\begin{document}

\begin{enumerate}
\defineVariables{
  A={randint(100,200)},
  B={randint(5,29)},
}
\sisetup{per-mode=fraction}
% initialize variables   
\initVariables
\item \textbf{An object is displaced \Var{A} meters in \Var{B} seconds.}
  \begin{equation*}
  v = \frac{\Delta s}{\Delta t}
    = \dfrac{\SI{\Var{A}}{m}}{\SI{\Var{B}}{s}}
    = \SI{\round{\Var{A}/\Var{B}}{5}}{\meter\per\second}
    \approx \SI{\round{\Var{A}/\Var{B}}{1}}{\meter\per\second}
  \end{equation*}

% initialize variables   
\initVariables
\item \textbf{An object is displaced \Var{A} meters in \Var{B} seconds.}
  \begin{equation*}
  v = \frac{\Delta s}{\Delta t}
    = \dfrac{\SI{\Var{A}}{m}}{\SI{\Var{B}}{s}}
    = \SI{\round{\Var{A}/\Var{B}}{5}}{\meter\per\second}
    \approx \SI{\round{\Var{A}/\Var{B}}{1}}{\meter\per\second}
  \end{equation*}

% initialize variables   
\initVariables
\item \textbf{An object is displaced \Var{A} meters in \Var{B} seconds.}
  \begin{equation*}
  v = \frac{\Delta s}{\Delta t}
    = \dfrac{\SI{\Var{A}}{m}}{\SI{\Var{B}}{s}}
    = \SI{\round{\Var{A}/\Var{B}}{5}}{\meter\per\second}
    \approx \SI{\round{\Var{A}/\Var{B}}{1}}{\meter\per\second}
  \end{equation*}
\end{enumerate}
\end{document}