When you have numbered lists that mix one-, two-, and possibly three-digit numbers you'll need two tabs, combining the right alignment of the numbers and the left alignment of the text.
Figure 12.6. A numbered list before formatting (example A) and the same text using a right and a left tab (example B). Note that the periods after the numbers are redundant and have been removed. Using the Control palette or the PageMaker Toolbar to convert the text to a numbered list adds numbers before each paragraph, but does not add tabs or formatting. The numbers are staticthat is, they do not update should you change the order of the text.