The STR() function will convert a numeric field to character. By default, I believe it creates a 10 character long, right justified field. There are a few options such as length, decimals and padding character to override these, but the easiest option is usually :
Depending on how your decimal is formatted, you might need to multiply by 100 and use the optional characters and use something like :
CHR returns the ASCII character for a given number. CHR(65), for example, returns the character 'A'.