Numeric Math Functions Oracle PLSQL

SQL>
SQL> set serveroutput on
SQL>
SQL> BEGIN
  2     DBMS_OUTPUT.PUT_LINE(TRUNC(3.5));
  3     DBMS_OUTPUT.PUT_LINE(TRUNC(105.09,1));
  4     DBMS_OUTPUT.PUT_LINE(TRUNC(-3.5));
  5     DBMS_OUTPUT.PUT_LINE(TRUNC(105.15,-2));
  6     DBMS_OUTPUT.PUT_LINE(TRUNC(150.15,-2));
  7  END;
  8  /
3
105
-3
100
100
PL/SQL procedure successfully completed.
SQL>