It is: 5.67*10^-1
111111111(√10) or 351364184.11178907464783491249265...
wait not the discription srry
(10 + 10 + 10 + 10 + 10)/10 = 5
nine fifths 18/10 = 9/10 + 9/10 18/10 = 9/5
111111111 × 111111111 = 1.234567899×10¹⁶
(111111111)^2 = 1.234567899 x 10^16
It is: 5.67*10^-1
111111111(√10) or 351364184.11178907464783491249265...
wait not the discription srry
10 to 10
There are no nine letter words using those letters, there are two eight letters words: Caryotin and Tornadic. Perhaps you meant Dictionary (but that has 10 letters)
Using Roman numerals 1 = I and 10 = X. If you put them in front of each other one then ten you get IX, which is 9 in Roman numbers.
7+2 8+1 10-1
(10 + 10 + 10 + 10 + 10)/10 = 5
nine fifths 18/10 = 9/10 + 9/10 18/10 = 9/5
9 + (9/9) = 10