Write down the value of the underlined digit

8  3  4
-
Value of the underlined digit ___________
1  8  2
    -
Value of the underlined digit ___________

3  8  4
        -
Value of the underlined digit ___________

8  1  6
    -
Value of the underlined digit ___________

6  7  2
-
Value of the underlined digit ___________
4  5  3
        -
Value of the underlined digit ___________

8  9  4
    -
Value of the underlined digit ___________

2  1  6
        -
Value of the underlined digit ___________