This is documentation for Mathematica 8, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.2)

Typing Fractions

Typing

Start with the expression that will be the numerator.
Type .
Click for copyable input
Create a built-up fraction by pressing the Control and / keys at the same time. The placeholder in the denominator is already selected.
Press Ctrl+/.
Click for copyable input
Fill in the denominator.
Type .
Click for copyable input
Move the insertion point out of the fraction by pressing the Control key and the Space bar at the same time.
Press Ctrl+Space.
Click for copyable input

Typing

Start with the expression that will be the numerator.
Type .
Click for copyable input
Create a built-up fraction by pressing the Control and / keys at the same time. The placeholder in the denominator is already selected.
Press Ctrl+/.
Click for copyable input
Fill in the denominator.
Type .
Click for copyable input
Move the insertion point out of the fraction by pressing the Control key and the Space bar at the same time.
Press Ctrl+Space.
Click for copyable input
Once the insertion point is out of the fraction, you can continue typing.
Type .
Click for copyable input

Typing

Start with the expression that will be the numerator.
Type .
Click for copyable input
Create a built-up fraction by pressing the Control and / keys at the same time. The placeholder in the denominator is already selected.
Press Ctrl+/.
Click for copyable input
Fill in the denominator.
Type .
Click for copyable input
Continue typing in the denominator and then move out of the fraction.
Type .
Click for copyable input
Move the insertion point out of the fraction by pressing the Control key and the Space bar at the same time.
Press Ctrl+Space.
Click for copyable input

Typing

Create a built-up fraction with Ctrl+/. The numerator and denominator contain placeholders; the one in the numerator is selected.
Press Ctrl+/.
Click for copyable input
Type an expression in the numerator.
Type .
Click for copyable input
Select the placeholder in the denominator by pressing the Tab key. (Alternatively, you can select the placeholder by clicking it or dragging.)
Press Tab.
Click for copyable input
Fill in the numerator.
Type .
Click for copyable input
Get out of the fraction by pressing the Control key and the Space bar at the same time.
Press Ctrl+Space.
Click for copyable input

Another Way of Typing

Start with the expression that will be the numerator.
Type .
Click for copyable input
Select the expression. (You can select by dragging, by pressing Ctrl+. repeatedly, or by clicking the expression repeatedly.)
Select it.
Click for copyable input
Create a built-up fraction by pressing Ctrl+/.
Press Ctrl+/.
Click for copyable input
Fill in the denominator.
Type .
Click for copyable input
Get out of the fraction by pressing the Control key and the Space bar at the same time.
Press Ctrl+Space.
Click for copyable input