This screencast discusses when matrix addition is defined and how it is carried out in general. This is then applied to an example involving three matrices where only two of them can be added.

Matrix Addition (MathsCasts)

These MathsCasts were produced by the mathematics support centres at Swinburne University, the University of Limerick and Loughborough University. They were part of a collaborative research project to develop high quality resources and investigate the effectiveness of MathsCasts to support mathematics learning. The full set of resources are available at http://commons.swin.edu.au/s/mathscasts MathsCasts are licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License

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Matrix Addition (MathsCasts)

Matrix Addition (MathsCasts)