Για την κατανόηση της εκτέλεσης των πράξεων στο δυαδικό σύστημα, σημειώστε το αποτέλεσμα ( S - D ) και το κρατούμενο-δανεικό ( C - B ), κάθε δυαδικής πράξης :


                                                                                   Πρόσθεση                                                                                    Αφαίρεση

                                                            Β    Α                S                   C                                                 Β    Α                D                   B
                                                            0 + 0 =                                      0 + 0 =
                                                            0 + 1 =                                      0 + 1 =
                                                            1 + 0 =                                      1 + 0 =
                                                            1 + 1 =                                      1 + 1 =