There is only one section that I've seen that discusses the use of column totals and number precision.
(I am using %12 to represent number values with one digit before and two decimal positions after.)
From: Add totals to a column design
Click and type a percent sign (%) followed by two digits from 0 to 9. The digits control how the data is displayed.
The first digit determines how many places appear before the decimal point. For example, if your total was 122, a digit of 3 would display 122. If you enter 0 for the first digit, the program adds the number of places necessary for the value.
The second digit determines how many places appear after the decimal point. Zeros are added as necessary, and values are rounded up or down as necessary. You can vary these numbers, depending on how many digits you need.