Texas Instruments TI-15 Explorer Owner's Manual page 11

To summarise different fraction forms:

Dividing a fraction by a fraction gives fractional results regardless of the division
setting (decimal or fraction).
The  mode settings provide 4 possible display options for computational
results displayed in fraction form.
For example, for 6 ÷ 4, the displays would look like this:
MANual simp/improper (n/d) :
AUTO simp/improper (n/d) :
MANual simp/mixed number (U n/d) :
AUTO simp/mixed number (U n/d) :

You can enter either the denominator or numerator first.
6
4
3
2
2
��
4
1
��
2
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