What is the purpose for the random number? Does it need to update
automatically?
One option would be to "Insert" an Excel worksheet, put "RAND()" in cell
A1, and shrink the "spreadsheet" down to only show the one cell. Once you
click elsewhere in the word document, you are left with a boxed random
number (0-1). You can add/multiply to get the range you want, round off,
or show however many digits you want.
***You can right click and "format object" to have the number "float over
text" and have other text wrap around it, or not float over the text, in
which case you could put it in the middle of a paragraph.
***You can double click the number, hit "F9" to get a new random number.