HP 35s Scientific Calculator - Manual (Page 220)

14-10 Programming Techniques
Flag
Status
Fraction–Control Flags
7 8 9
Clear
(Default)
Fraction display
off; display real
numbers in the
current display
format. Fraction
denominators not
greater than the /c
value. Reduce fractions to
smallest form.
Set Fraction display
on; display real
numbers as
fractions. Fraction
denominators are
factors of the /c
Value. No reduction of
fractions. (Used
only if flag 8 is
set.)