HP 35s Scientific Calculator - Manual (Page 101)

Fractions 5-9
Example:
Suppose you have a 56 3 /
4
–inch space that you want to divide into six equal
sections. How wide is each section, assuming you can conveniently measure 1 /
16
–
inch increments? What's the cumulative roundoff error?
Fractions in Equations
You can use a fraction in an equation. When an equation is displayed, all
numerical values in the equation are shown in their entered form. Also, fraction-
display mode is available for operations involving equations.
When you're evaluating an equation and you're prompted for variable values, you
may enter fractions — values are displayed using the current display format.
See chapter 6 for information about working with equations.
Keys: Display: Description:
  Sets Flag 8
 Sets up fraction format for 1 /
16
–
inch increments. (Flags 8 and 9
should be the same as for the
previous example.)

D
  Stores the distance in D.
   The sections are a bit wider than 9
7 /
16
inches.
    Rounds the width to this value.
   Width of six sections.
D    The cumulative round off error.
  ()    Clears flag 8.
   Turns off Fraction–display mode.