How do I write this in LaTeX?

One possibility is the mathabx package:

\documentclass{article}
\usepackage{mathabx}

\begin{document}

\[
  \odiv
  \oplus
  \ominus
  \otimes
\]
    
\[
  \bigodiv
  \bigoplus
  \bigominus
  \bigotimes
\]
    
\end{document}

If you don't need the big versions, then the stix package would be another alternative.