I'm pleased to present the Matrix Operator Calculator. Enter 2 matrices of any row and column size, and you are able to add, subtract, or multiply them. If the matrices are not able to have the operation performed on them due to row/column combos, the calculator will flash you a warning message.
The matrix operator not only gives you the answer, but the math involved for each entry of the answer matrix. See instructions for entering matrix entries, but it's quite easy.
It's located on the linear algebra page and searchable by matrix, matrices, operation. I plan on putting a new lesson out there that will give you the determinant, inverse, and adjoint of any matrix. However, if anybody feels that it would add value to have those on this lesson, please let me know, such as having det|AB|. Otherwise, one could use this calculator, and then drop the matrix answer into the other lesson I'm building for the determinant, inverse, or adjoint.
Let me know if you have any corrections or want enhancements. Enjoy!
AB Matrix Operations