Numeric Math Functions Oracle PLSQL

SQL>
SQL> set serveroutput on
SQL>
SQL> BEGIN
  2     DBMS_OUTPUT.PUT_LINE(ROUND(3.5));
  3     DBMS_OUTPUT.PUT_LINE(ROUND(105.09,1));
  4     DBMS_OUTPUT.PUT_LINE(ROUND(-3.5));
  5     DBMS_OUTPUT.PUT_LINE(ROUND(105.15,-2));
  6     DBMS_OUTPUT.PUT_LINE(ROUND(150.15,-2));
  7  END;
  8  /
4
105.1
-4
100
200
PL/SQL procedure successfully completed.
SQL>
SQL>