How to do priority of operations (+ * - /) in my grammars?

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Antlr

I define my own grammars using antlr 4 and I want to build tree true According to Priority of Operations (+ * - /) ....

I find sample on do Priority of Operations (* +) it work fine ...

I try to edit it to add the Priority of Operations (- /) but I failed :(

the grammars for Priority of Operations (+ *) is :

 println:PRINTLN  expression SEMICOLON {System.out.println($expression.value);};
 expression returns [Object value]:
  t1=factor {$value=(int)$t1.value;}
  (PLUS t2=factor{$value=(int)$value+(int)$t2.value;})*;

  factor returns [Object value]: t1=term {$value=(int)$t1.value;}
  (MULT t2=term{$value=(int)$value*(int)$t2.value;})*;

 term returns [Object value]:
  NUMBER {$value=Integer.parseInt($NUMBER.text);}
   | ID {$value=symbolTable.get($value=$ID.text);}
   | PAR_OPEN expression {$value=$expression.value;} PAR_CLOSE
   ;
MULT :'*';
PLUS :'+';

MINUS:'-';
DIV:'/' ; 

How I can add to them the Priority of Operations (- /) ?

What I have tried:

all my try failed :( maybe I have missunderstund the greammers