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 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.
Tap to view your calculator history. You can tap an entry to calculate it again or edit it.