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<!DOCTYPE html> <html> <body> <p>Click the button to call myMethod() that display a number's half value.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> Number.prototype.myMethod = function() { return this.valueOf() / 2; }; function myFunction() { var n = 55; document.getElementById("demo").innerHTML = n.myMethod(); } </script> </body> </html>