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google search
Google search results:
1: https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:matrices/x9e81a4f98389efdf:properties-of-matrix-multiplication/a/properties-of-matrix-multiplication
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2: https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:matrices/x9e81a4f98389efdf:properties-of-matrix-addition-and-scalar-multiplication/a/properties-of-matrix-addition
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3: https://cliffsnotes.com/study-guides/algebra/linear-algebra/matrix-algebra/operations-with-matrices
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4: http://www.ltcconline.net/greenl/courses/203/MatricesApps/MatrixOpsProps.htm
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5: https://www.purplemath.com/modules/numbprop.htm
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6: http://www.math.utep.edu/Faculty/cmmundy/Math%202301/0495292974_CHPT_03.pdf
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7: https://www.gauthmath.com/solution/Which-of-the-following-property-does-not-hold-for-matrix-multiplication-Select-o-1702876588768262
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8: https://home.iitk.ac.in/~arlal/MTH102/la.pdf
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9: https://people.maths.ox.ac.uk/flynn/genus2/sheets0405/grfnotes1011.pdf
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10: http://math.bu.edu/people/if/LinearAlgebraPDF/LAchapter2.pdf
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11: https://www.math.ucdavis.edu/~linear/linear-guest.pdf
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