More Practice

Usually people write A0 = 0A = 0 where it is assumed that the zero matrix has the correct dimensions to make the multiplication possible.

It would be good at this point to practice matrix multipliction. The goal is to interalize the idea so that it becomes one of your active concepts, not a faintly recalled notion you have to look up each time.

In the following, mentally (or on paper) multiply the two matrices. Click on the "=" button to check your answer. Change elements in A and B and work the problem again. To change an element, replace the contents of a cell and then click outside of the cell.

A				B				=	C

Try some interesting problems, such as:

1 0 0 1

1 2 3 4

=

1 2 3 4

1 0 0 1

=