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Khan Academy
Khan Academy: Linear Algebra: Distributive Property of Matrix Products
Video shows that the distributive property is true for multiplying matrices. [9:52]
Virtual Nerd
Virtual Nerd: How Do You Subtract Matrices?
Instructional video illustrates the steps of subtracting matrices. [4:19]
Virtual Nerd
Virtual Nerd: How Do You Add Matrices?
Instructional video shows the entire process step-by-step of how to add matrices. [3:38]