HP 33s - Manual (Page 85)

Fractions 5–3
Entered Value Internal Value Displayed Fraction
2
3
/
8
2.37500000000
 + 
14
15
/
32
14.4687500000  +
54
/
12
4.50000000000
 +
6
18
/
5
9.60000000000
+
34 /
12
2.83333333333
 +  T
15
/
8192
0.00183105469
+  S
12345678
12345
/
3
(Illegal entry)  ¤
16
3
/
16384
(Illegal entry)  ¤
Accuracy Indicators
The accuracy of a displayed fraction is indicated by the c and d annunciators at
the right of the display. The calculator compares the value of the fractional part of
the internal 12–digit number with the value of the displayed fraction:
„ If no indicator is lit, the fractional part of the internal 12–digit value exactly
matches the value of the displayed fraction.
„ If d is lit, the fractional part of the internal 12–digit value is slightly less than
the displayed fraction — the exact numerator is no more than 0.5 below the
displayed numerator.
„ If c is lit, the fractional part of the internal 12–digit value is slightly greater
than the displayed fraction — the exact numerator is no more than 0.5 above
the displayed numerator.
This diagram shows how the displayed fraction relates to nearby values — c
means the exact numerator is "a little above" the displayed numerator, and d
means the exact numerator is "a little below".
0 7/16
6
16
/
0 7/16 0 7/16
(0.40625)
6.5
16
/
7
16
/
7.5
16
/
8
16
/
(0.43750) (0.46875)