HP HP-67

Getting Started 29
Negative Numbers
To key in a negative number, press the keys for the number, then
press (change sign). The number, preceded by a minus (—) sign,
will appear in the display. For example, to change the sign of the
number now in the display:
Press Display
i -148.84
You can change the sign of either a negative or a positive nonzero
number in the display. For example, to change the sign of the -148.84
now in the display back to positive:
Press Display
Notice that only negative numbers are given a sign in the display.
Clearing
You can clear any numbers that are in the display by pressing
(clear X). This key erases the number in the display and replaces it
with
Press Display
If you make a mistake while keying in a number, clear the entire num-
ber string by pressing [E%¥3. Then key in the correct number.