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Use Calculator on iPod touch
In the Calculator app 
, you can perform basic arithmetic calculations with the standard calculator. Or use the scientific calculator for exponential, logarithmic, and trigonometric functions.
Siri: Say something, like “What’s 74 times 9?” or “What’s 18 percent of 225?” Ask Siri on iPod touch.
Use the scientific calculator
Rotate iPod touch to landscape orientation.
Copy, delete, or clear numbers
Copy a calculation result: Touch and hold the calculation result in the display, tap Copy, then paste the result somewhere else, such as a note or message.
Delete the last digit: If you make a mistake when you enter a number, swipe left or right on the display at the top.
Clear the display: Tap the Clear (C) key to delete the last entry, or tap the All Clear (AC) key to delete all entries.