90.016
90.016
90.016
90% = 0.9
.09
0.090
3.090
0.900.
90% = 0.900 to the nearest thousandth.
If you mean 90 and 19/1000 then as a decimal it is 90.019
If you mean: 4 and 90/1000 then it is 4.09
It is 0.9 (or 0.90 if you wish to emphasise the precision).
decimal places go .1(tenths) .01(hundredths), and .001(thousandths) and there are 10 thousandths in a hundredth and 10 hundredths in a tenth .9 is 9 tenths which is 90 hundredths or 900 thousandths but normally you would just say "nine tenths"