HP 20B - Manual (Page 16)

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 10 23 . 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