Remember when adding or subtracting matrices, the matrices must be the same size. Corresponding elements are added or subtracted to give elements of the new matrix.

Example:

1 3 5

A = 5 7 8

2 0 9

-2 8 0

B = 3 1 1

5 0 2

1-2 3+8 5+0 -1 11 5

A + B = 5+3 7+1 8+1 = 8 8 9

2+5 0+0 9+2 7 0 11

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