The following calculator allows you to calculate 2x2 matrix arithmetic. Enter the values into the matrix into the top two matries and then press "+  or * " to display the result in the bottom matrix:
The following calculator allows you to calculate 2x2 matrix arithmetic. Enter the values into the matrix into the top two matries and then press "+  or * " to display the result in the bottom matrix:
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see also: 

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Mathematics for 3D game Programming  Includes introduction to Vectors, Matrices, Transforms and Trigonometry. (But no euler angles or quaternions). Also includes ray tracing and some linear & rotational physics also collision detection (but not collision response). 
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