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General Operating Instructions
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Clearing Data
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Entries can be cleared as follows:
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Financial function entries can be cleared before or immediately after they are loaded by pressing  CLx.
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All other entries can be cleared before they are loaded by pressing CLx. After these entries are loaded, they can be cleared by pressing CLx (CLEAR);
the problem must then be reentered.
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A blinking error signal can be cleared by pressing CLx.
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Constant
storage is cleared by turning the calculator off then on, or by writing
over the present contents; that is, by storing a new number.
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It isn’t always necessary to clear the calculator ( CLx [CLEAR])—when starting a new calculation—although it is usually comforting.
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There are, however, certain applications that require clearing the calculator before performing the calculation. They are:
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Discounted Cash Flow Analysis
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Mean, Standard Deviation
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Linear Regression (Trend Line) Analysis
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Performing Simple Arithmetic
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In the HP-80, arithmetic answers appear immediately after pressing any one of the arithmetic keys: + – × ÷
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For example, add 12 and 3.
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