JSFiddle - React, Tailwind, and code Playground

HTML

<h1 id="ident">
Rechenaufgabe
</h1>

<p onclick="zufall()">
Rechenaufgabe
</p>

JavaScript

function zufall() {
  var x = Math.floor(Math.random() * 10 + 1);
  var y = Math.floor(Math.random() * 10 + 1);
  document.getElementById("ident").innerHTML = x + "+" + y + "= ?";
}