7
It has no precision, since there is no following number.
The "2".
In this case with 234.896 the last digit, '6' determines the precision since in is the last non-zero digit.
The last digit, 2.
7
8
3
The farthest to the right.
Always the last number, so in this example the precision is to hundredths.
If a number is given to the true degree of precision, this is always determined by its last digit - in this case, 6.
None of them, you do that! You have given it to the precision of 3 decimal places or 6 significant figures however.
3