Apple iPhone iOS 5.1 - Manual (Page 130)

Calculator
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Using the calculator
Tap numbers and functions in Calculator just as you would with a standard calculator. When you
tap the add, subtract, multiply, or divide button, a white ring appears around the button to let you
know the operation to be carried out.
Add a number to memory.
Clear memory.
Clear the display.
Subtract a number
from memory.
Get a number from
memory (a white ring
indicates a number is
stored in memory).
Scientific calculator
Rotate iPhone to landscape orientation to display the scientific calculator.
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