To multiply matrices, the number of columns in the first one must be the same as the number of rows in the second one, otherwise they do not conform and cannot be multiplied.

Remember to use each row of the first matrix with each column of the second.

Matrix multiplication is associative - **P(QR) = (PQ)R**

Matrix multiplication is not commutative - **AB** is not the same as **BA**

Matrix multiplication is distributive - **P(Q+R) = PQ + PR**

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