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Introduction 7
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If you make a mistake when keying in a number, clear the entire number by pressing CLx (clear X); then key
in the number correctly.
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Negative Numbers. To key in a negative number, press CHS (change sign) after keying in the positive
value. For example, to key in –12:
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Press: 12 CHS
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To change the sign of a negative or positive number, press CHS. For example, to change the previous number
back to a positive 12:
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Press: CHS
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Performing Simple Arithmetic
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In the HP-65 arithmetic answers are calculated by pressing +, –, ×, or ÷. For any problem
having two numbers and one arithmetic operator, you key in the first number and save it by pressing ENTER ;
then you key in the second number and follow it by the arithmetic operator. For example, add 12 and 3 by pressing:
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12 ENTER 3 +
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The calculator uses the last number saved and the last number keyed in: it adds the latter to the number saved;
it subtracts the latter from the number saved; it multiplies the latter by the number saved; or it divides the
latter into the number saved. For example, you can subtract 3 from 12 by pressing:
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12 ENTER 3 –
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To divide 12 by 3, press:
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12 ENTER 3 ÷
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Nonarithmetic Functions
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A blue symbol on the inclined lower key surface denotes the function of the key when preceded bv the
downshift g key. A gold symbol above the key denotes the function of the key when
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