Your question is unclear. Is it about matrices? Just looking at a matrix (array) does not reveal any "facts" except for that the matrix elements (numbers) are.
A 2 x 9 matrix cannot be multiplied with a 5 x 9 matrix. You CAN multiply a 2 x 9 and a 9 x 5 matrix.
number sence. what multiplication fact can be found by using the arrays for 2x9 and 5x9 ?
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