Checking on a potential 'Mitty'

[SATCOS WHIPPING BOY]

Originally Posted by AARON O'DICKYDIDO

1 X 8 = 8
9 X 17 = 153
5 X 4 = 20
0 X 16 = 0
3 X 2 = 6
8 X 13 = 104
5 x 5 = 25
Total = 316(A) / 23 = 13(.73913) x 23 = 299(B)
(A)316 – (B)299 = 16 = Letter S

My letter is W! Where have I gone wrong?

Aaron.

For starters 316 - 299 isn't 16