-9
The digit in the ones place is 7.
9
1
The unit digit of the square of 81 will be 1.
-9
The last digit, 2.
The digit in the ones place is 7.
It has no precision, since there is no following number.
The "2".
9
1
4
The unit digit of the square of 81 will be 1.
The last digit: the 6.The last digit: the 6.The last digit: the 6.The last digit: the 6.
7
7