Using a simple alphabet cipher based on the 24 letter Elizabethan alphabet, (as shown here), "Francis" adds to 67, "Bacon" to 33, and therefore "Francis Bacon" equates to 100. This cipher is found throughout the Shakespeare, Bacon and related works, as detailed extensively for example in the remarkable book "Secret Shakespearean Seals", on-line at the link in the sidebar.
It is remarkable that the word "Sonnets" also equates to 100. Given that "Shakespeare's" may be read as "Shakespeare is", this means that the title "Shakespeare's Sonnets" is equivalent by cipher substitution to "Shakespeare is Francis Bacon"!