Apple iPhone (For iOS 6.1) - Manual (Page 103)

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Calculator
Tap numbers and functions in Calculator just as you would with a standard calculator.
Add a number
to memory.
Add a number
to memory.
Clear memory. Clear memory.
Clear the display. Clear the display.
Subtract a number
from memory.
Subtract a number
from memory.
Get a number from
memory (a white
ring indicates a
number is stored in
memory).
Get a number from
memory (a white
ring indicates a
number is stored in
memory).
Use the scientific calculator: Rotate iPhone to landscape orientation.