Quote " Cubit #1 has a over all value of 1 having 7 palms 28 digits: Cubit #2 has a value of 1 having no palms and 27 digits: Cubit #3 has a value of 1 having 6 palms with 24 digits. The perimeter G1 is 1760 cubits the height is 280 cubits. The Kings Chamber length 20 cubits is 1/88 the perimeter, the Grand Gallery horizontal roof length is 1/22 the perimeter, the length of the Grand Gallery floor to the Great Step is 1/20 the perimeter. "
It is a shame that a cubit of 25 digits hasn't been located as that is the one to look for and I know it existed in Israel.
280RC X 25 = 7000
440RC X 25 = 11000
As to decimal we know it existed in the Indus Valley and Thor Heyerdahl proved able to sail from Egypt to Indus on a reed boat still so much to discover.