Is running through the alphabet ruining your little Robert's day? Making learning the alphabet a breeze with these preschool letter R worksheets that focus on letter recognition, tracing and common R words. Preschoolers can't master all of the letters at once. Take it slow by focusing on a letter like R. Your preschooler will be especially excited if R appears in their name, address, or other special phrases. After R, introduce letter S worksheets.