1. You have drawn 'arrow's to illustrate how to get the 4 products in the 2nd line. It would be clearer if each time, you draw an arrow to show the product, then write down the term first; before moving on to find the next product.

    For example, after you've drawn the arrow from "3m" to "3m", write down "9m²" first.
    Then move on to show "2n" to "2n".
    That would make your explanation to the steps even clearer :)

    Good to include the explanation with the diagram too!