Add values to an ANTLR grammar

Question

I have a grammar:

    grammar SimpleCalc;

expr : term ( ( '+' | '-' ) term )* ';' ;
term : number ;
number  : DIGIT+ ;  
DIGIT : '0'..'9' ;
WHITESPACE : ( '\t' | ' ' | '\r' | '\n'| '\u000C' )+ -> channel(HIDDEN);

Exit:

    Parse Tree:
expr (
 term (
  number (
   "3"
  )
 )
 "+"
 term (
  number (
   "2"
  )
 )
 ";"
)

To add multiplication and division, would just do that?

expr : term ( ( '+' | '-' ) term )* ';' ;

I’m a little lost, if you have some doc to help me would be great