What You Must Know
Deferring Evaluation
You don't have to complete and evaluate an expression as soon as you enter it. You can enter part of an expression, leave the page to check work on another page, and then come back to the page to the complete the expression at a later time.
Forcing a Decimal Approximation
To force a decimal approximation in a result, complete one of the following actions:
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Touch and hold , and then slide to select  to evaluate the expression. |
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Include a decimal in the expression. |
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Wrap the expression in the approx() function. |
Accessing Calculator History Items
You cannot edit an expression if the result has been calculated. However, you can copy the expression from the history and paste it into the entry line.
Copying History Items
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Drag the work area up or down to find the expression or result you want to copy. |
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Tap the expression to select it and open the context menu. |
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Tap to copy the expression into the active entry line. |
Copying Part of an Expression
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Tap the expression to select it. |
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Drag the handles to highlight the part of the expression you want to copy. |
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Tap or tap to copy the selected item to the active entry line. |
Clearing Calculator History
When you clear the history, all variables and functions defined in the history retain their current values. To clear all items in the Calculator history:
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Tap  and go to . |
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Tap to remove all expressions and results from the history. |
Note: If you clear the history by mistake, touch and hold 
, and then tap to restore the history items.