Show numbers on help lines (tikz)

Question

I want to learn tikz, but since I can't visualize coordinates, I need to draw/show step numbers on help lines. How can I achieve this?

\documentclass{standalone}
\usepackage{tikz}
\begin{document}
  \begin{tikzpicture}
    \draw[help lines, color=red!40, dashed, xstep=0.5cm,ystep=0.5cm] (-9.9,-9.9) grid (9.9,9.9);
    \draw[<->,ultra thin] (-9,0)--(9,0) node[right]{$x$};
    \draw[<->,ultra thin] (0,-9)--(0,9) node[above]{$y$};.
  \end{tikzpicture}
\end{document}

Answer 1

If you want something like this:

then add only two extra lines in \begin{tikzpicture}...\end{tikzpicture}.

\tkzInit[xmax=10,ymax=10,xmin=-10,ymin=-10]
%\tkzGrid
\tkzAxeXY

Of course, use \usepackage{tkz-euclide}.

Complete Example:

\documentclass{standalone}
\usepackage{tkz-euclide}
\begin{document}
  \begin{tikzpicture}
    \tkzInit[xmax=10,ymax=10,xmin=-10,ymin=-10]
    %\tkzGrid
    \tkzAxeXY
    \draw[help lines, color=red!40, dashed, xstep=0.5cm,ystep=0.5cm] (-9.9,-9.9) grid (9.9,9.9);
    \draw[<->,ultra thin, step=1cm] (-9,0)--(9,0) node[right]{$x$};
    \draw[<->,ultra thin] (0,-9)--(0,9) node[above]{$y$};.
  \end{tikzpicture}
\end{document}

Update:

\documentclass{standalone}
\usepackage{tkz-euclide}
\begin{document}
  \begin{tikzpicture}
    \tkzInit[xmax=10,ymax=10,xmin=-10,ymin=-10]
    %\tkzGrid
    \tkzAxeXY
    \draw[help lines, color=red!40, dashed, xstep=0.5cm,ystep=0.5cm] (-9.9,-9.9) grid (9.9,9.9);
    \draw[<->,ultra thin, step=1cm] (-9,0)--(9,0) node[right]{$x$};
    \draw[<->,ultra thin] (0,-9)--(0,9) node[above]{$y$};.
  \end{tikzpicture}
\end{document}