The missing number is 81.
To solve for the missing number, we can observe that each column value in the second column is obtained by multiplying the corresponding value in the first column by 9.
So, to find the missing number in the second column when the first column value is 9, we can multiply 9 by 9:
9 * 9 = 81
Therefore, the missing number in the second column when the first column value is 9 is 81.
1 9
2 18
6 54
9 [__]
[__] 90
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