Since there are 15 grams of powder in a 22oz serving, if you divide 198 by 22 you will get 9 total servings. If you multiply 15 by 9 you will get 135 total grams.
There are 5 tenths, 6 hundredths, and 3 thousandths. The first decimal is the tenths, the second decimal is the hundredths, and the third decimal is the thousandths.