What kind of letters?
thirty-eight or XXXVIII
n - 38
The numbers and letters on a P-38 or on any USAAF fighter were the BuNuumber, usually a 5 digit number, and sometimes squadron ID letters.
You write the number 2012 in letters like this: Two thousand,twelve. Easy.
Five.
(xx)mmmxix
Thirty Seven.
38/75 can't be a mixed number. Mixed numbers are greater than 1.
0.038 = 38/1000
The number 300,012 is written in letters as "three hundred thousand twelve."
100 = one hundred.
one hundred and thirty
Xix viii mmxi (you cannot write it in 9 letters only possible with 11 letters)