Wrong precision of multiplication result

Hello!
In same cases the result of multiplication in sql is rounded.For example, if i want to multiplay the numbers:
SQL> select 38.69*0.335616438356164 from dual
the result I get is: 12,985
but it should be: 12,98499999999364
Does anybody know where's the problem? Thanks.
I'm using Oracle 10.2.0.1
Matthew

SQL> set numwidth 10
SQL> select 38.69*0.335616438356164 from dual
2 /
38.69*0.335616438356164
                 12,985
1 rij is geselecteerd.
SQL> set numwidth 38
SQL> select 38.69*0.335616438356164 from dual
2 /
               38.69*0.335616438356164
                  12,98499999999998516
1 rij is geselecteerd.Regards,
Rob.

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