MATRIX × MATRIX
ROW BY COLUMN
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Row × Column
1
2
3
4
5
6
7
8
19
22
43
50
A
B
AB
=
Row × Column
multiply + add
2×2 · 2×2
= 2×2
AB ≠ BA
order matters
1. Rule
Each entry of AB = row of A
× column of B (then add)
2. Shart
Columns of A = rows of B
(m×n)(n×p) = m×p
3. Remember
AB ≠ BA (usually)
order matters
MATRIC MATHS · MATRICES AND DETERMINANTS · PUNJAB BOARDS
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