Matrix arithmetic
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The commutative property works for adding and multiplying e.g. 2+4=4+2 and 3x4=4x3. But it doesn't work for subtraction and division so 5-3≠3-5 and 6÷2≠2÷6 so subtraction and division could be considered as exceptions.
No. Multiplication of matrices is, in general, non-commutative, due to the way multiplication is defined.
No. Matrix addition (or subtraction) is defined only for matrices of the same dimensions.
Sometimes . . A+
The answer depends on the context. For example, multiplication of numbers is commutative (A*B = B*A) but multiplication of matrices is not.