8
4082 Since the tens digit is 2 times the thousand digit, it must be an even digit. So it can be 8, 6, 4, or 2. But, the thousands digit is 4 greater than the hundred digit. So that the hundred digit must be 0, the thousands digit must be 4, the hundreds digit must be 8, and the ones digit must be 2.
the leading digit
0 - There are no 0s in pi 1 - 2nd digit 2 - 7th digit 3 - 1st digit 4 - 3rd digit 5 - 5th digit 6 - 8th digit 7 - 14th digit 8 - 12th digit 9 - 6th digit
first digit time second digit and second digit times first digit then repeat
In this case with 234.896 the last digit, '6' determines the precision since in is the last non-zero digit.
7
It has no precision, since there is no following number.
7
3
There a four significant figures in the number 16.82, the last '2' determines the best precision available.
The last digit, 2.
2
The "2".
4
3
7