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Master introductory matrices: Matrix addition, scalar multiplication, matrix multiplication condition ($c_1 = r_2$), and transpose properties.
Matrices in Grade 9 provide an easy scoring foundation for Optional Mathematics.
Two matrices $A_{m \times n}$ and $B_{p \times q}$ can only be multiplied if the number of columns in $A$ equals the number of rows in $B$ ($n = p$). The resulting matrix has dimensions $m \times q$. Always verify row-by-column alignment.
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