HP HP-65 - Page 9

If you make a mistake when keying in a number, clear the entire
number by pressing ‘€LX (clear X); then key in the number cor-
rectly.
Negative Numbers. To key in a negative number, press
(change sign) after keying in the positive value. For example, to
key in —12:
Press: 12 |CHS
To change the sign of a negative or positive number, press CHS .
For example, to change the previous number back to a positive
12:
Press: CHS
Performing Simple Arithmetic
In the HP-65 arithmetic answers are calculated by pressing + ,
- ,/x , or/+ . For any problem having two numbers and one
arithmetic operator, you key in the first number and save it by
pressing |ENTER4 ; then you key in the second number and follow
it by the arithmetic operator. For example, add 12 and 3 by
pressing:
12 (ENTER® 3 +
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 num-
ber saved; or it divides the latter into the number saved. For
example, you can subtract 3 from 12 by pressing:
12 ENTER4 3 -
To divide 12 by 3, press:
12 ENTER¢ 3 +
Nonarithmetic Functions
A blue symbol on the inclined lower key surface denotes the
function of the key when preceded by the downshift [@ key. A
gold symbol above the key denotes the function of the key when