Select Fraction from the list to display numbers as fractions e.g. 0.5 as ½, 2.5 as 2½.
In the Display as box, specify the precision of the fraction. You can choose from Auto, which will display the most accurate fraction possible in Ability, to 4ths, that is the number will be rounded to the nearest ¼ fraction.
Select the Thousands with Commas checkbox for comma formatted numbers i.e. 1,345,622 rather than 1345622.
Select the Negatives in Brackets checkbox to enclose negative numbers in brackets i.e. (2½) rather than -2½.
Select the Negatives in Red checkbox to display negative numbers in red font.
Note that with the Fraction format you should set the width to either Single, Double or Currency to take account of the fractional part of a number i.e. the digits to the right of the decimal point. Fractions cannot be expressed in a field with Long width, since this can only contain numbers without a decimal part.
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