From the Home screen, tap .


Enter numbers and arithmetic operators on the Basic panel.
Swipe the Basic panel to the left to open the Advanced panel, then swipe to the right to go back to the Basic panel.
Tap the Delete Key  to delete
the last number or operator you entered. Tap and hold the Delete Key
 to delete
the last number or operator you entered. Tap and hold the Delete Key  to delete all of the entered information.
 to delete all of the entered information.
Tap the Menu Key  to open an Options menu to
clear your calculation(s) history or change panels between Advanced
and Basic.
 to open an Options menu to
clear your calculation(s) history or change panels between Advanced
and Basic.
Tap  to view your
calculator history. You can tap an entry to calculate it again or
edit it.
 to view your
calculator history. You can tap an entry to calculate it again or
edit it.