\documentclass{standalone}
\usepackage{tikz}
\usepackage{amsmath}
\usetikzlibrary{matrix}
\begin{document}

\begin{tikzpicture}
\matrix[matrix of nodes] (mat)
{
    1 & 2 & 3 \\
    4 & 5 & 6 \\
    7 & 8 & 9 \\
};
\end{tikzpicture}
\end{document}

Create first step of matrix
Create first step of matrix
