HP HP-20S - Full Precision of a Number (SHOW); Range of Numbers

Full Precision of a Number (SHOW)
To temporarily view all 12 stored mantissa digits of the
number in the display, press (¥y] and then hold down
[sHow]. The 12 digits are shown without the decimal
point.
Starting with four decimal places ([#] 4):
Keys: Display: Description:
10 (+] 7 (=] 1.4286
(=) 142857142857 Displays 12 digits.
1 (=] 80 [*4)[=) —0.0125
(=) —125000000000 Displays 12 digits.
Range of Numbers
The range of numbers the HP-20S can store is shown below.
Underflow displays zero. Overflow displays the OFLO message for a
moment, then the largest positive or negative number possible.
Numbers the HP 20S Can Store
0
Overflow Aderflow Overflow
— ~—r— ——
~9.99999999999 x 10*°° 9.99999999999 x 10 "
-499 ~ 499
-1 x 10 0O 1x10
20 1: Getting Started