1 9
2 18
6 54
[__] 9
90 [__]
1 9
2 18
6 54
9 9
90 90
In the first row, 1 is multiplied by 9 to get 9.
In the second row, 2 is multiplied by 9 to get 18.
In the third row, 6 is multiplied by 9 to get 54.
In the fourth row, 9 is multiplied by 1 to get 9.
In the fifth row, 90 is multiplied by 1 to get 90.