Let's say we have matrix

**A**and matrix

**B**. We want to calculate

**AB**. Write down the two matrices side-by-side. Then

**move matrix A down**. Now write your answer in the space at the bottom right. I think the next step is self-explanatory from the picture below, but read the original blog post for a full explanation.

And - on the subject of matrices - this made me chuckle:

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