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.
Thirty Seven.
(xx)mmmxix
38/75 can't be a mixed number. Mixed numbers are greater than 1.
0.038 = 38/1000
one hundred and thirty
100 = one hundred.
38/4 = 9 and 1/2
Expressed in digits, this is equal to 3800000.