send radio button selected value to modal bottom sheet in Flutter

I have a modal bottom sheet on my page, whit 2 radio buttons. Radio button class is inside the same page. Modal bottom sheet cannot reach selected value from radio button class. In this case, anything will happens when i click the ElevatedButton. If i delete if (value ==2), the function will execute only the divide operation. How can i reach the selected value?

This is the modal button to execute once radio button is selected:

ElevatedButton(onPressed: (){
            if (value == 1){
              multiply();
              Navigator.of(context).pop();
              Navigator.of(context).push(
                  MaterialPageRoute(builder: (context) => result()));

            }else if (value ==2){
              divide();
              Navigator.of(context).pop();
              Navigator.of(context).push(
                  MaterialPageRoute(builder: (context) => result()));
            };

This is the radio button class:

class MyStatefulWidget extends StatefulWidget {
const MyStatefulWidget({Key? key}) : super(key: key);
 @override
 State<MyStatefulWidget> createState() => _MyStatefulWidgetState();}
 /// This is the private State class that goes with MyStatefulWidget.
 class _MyStatefulWidgetState extends State<MyStatefulWidget> {
 int value = 0;
 Widget CustomRadioButton(String text, int index) {
 return OutlinedButton(
   onPressed: () {
     setState(() {
       value = index;
     });
   },
   child: Text(
     text,
     style: TextStyle(
      color: (value == index) ? Colors.white : Colors.black,
     ),
   ),
   style: OutlinedButton.styleFrom(
     shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(5)),
     primary: Colors.white,
     backgroundColor: (value == index)?Colors.deepOrange: Colors.white,
   ),
 );
 }
 @override
 Widget build(BuildContext context) {
 return Column(
   children: <Widget>[
     CustomRadioButton("Multiply", 1),
     CustomRadioButton("Divide", 2),
   ],
  );
 }