Octodecimal fractional numbers and abbreviations.

Three photos illustrate what constitutes fractional numbers. In a way fractional numbers (1&2) must be 'spelled out' as where abbreviations (3) are disambiguated by not providing a place value.

Consonants from the source words must correspond to the target abbreviations, the R functions as a filler from where (left or right) the consonants were derived.

Photo 1, points out duel Rs. RR occupies the first place value. All the others are fractional numbers.