HP 20B User Manual

Mathematical Calculations
16
2 Mathematical Calculations
Mathematical Functions
Mathematical functions are located:
 On keys, such as, +-*/, etc.
 On shifted, or secondary functions, such as, :p
 In the Math menu, :s
Number Entry and Display
Numbers are entered by pressing:
 Numbered keys, 0-9
 The decimal point .
 The } key
 The :w keys
To correct a number entry, press the backspace key, {. Each press of { erases the last digit or symbol you entered.
To enter a number in the display, press the number digits successively. A number can have up to 12 digits.
To change the sign of a number from positive to negative, press }.
Use scientific notation to enter very large and very small numbers. For example, to enter the number
127
1023.1 
in scientific
notation, first enter the mantissa ( 1.23 ) and then press :w and enter the number ( 127 ) representing the exponent.
The exponent must have a value between -499 and +499.
Figure 1 Scientific Notation in FIX=2 Mode

HP 20B Specifications

General

Type	Financial
Cover	-
Form factor	Pocket
Control type	Buttons
Product color	Black
Digits	12 digits
Display type	LCD
Display tilting	No
Display number of lines	2 lines
Battery type	CR2032
Power source	Battery
Auto power off	Yes
Number of batteries supported	2
Memory registers	110

Weight and Dimensions

Depth	149.2 mm
Width	77 mm
Height	16 mm
Weight	37.5 g