This 5x3 fiasco has nothing to do about Common Core. Common Core is a set of standards, not a curriculum!
1) The student can argue that he is applying higher order mathematics by applying the real number Commutative Laws of Addition and Multiplication --> A+B = B+A and A*B = B*A. Thus, to deduct 1 point has nothing to do with mathematics, but mainly a pedagogical goal. Again, Common Core is a set of standards, not a curriculum! Mathematical Laws are well define and simple. This teacher only obfuscate the student to mathematics due to her own ignorance of mathematics.
2) In as much as series and matrix, mathematics already clearly define these terms mathematically already. One cannot argue against fundamental mathematical laws while in the process of preparing the student, goal wise at the onset at least, for other basic mathematical principles and calculations. This isn't even higher level math, such as abstract algebra or topology, yet. Again, enough with the obfuscation and pedagogical goal!
Thus and for example, Commutative Law of Multiplication is not applicale for real number matrices. As is correct when the student received a -1 for the 4x6 matrix answer --> matrix is row x column format.
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