Negative number grids

It might be good to introduce (or re-introduce) the idea of the multiplication grid first:

Screen Shot 2016-06-23 at 18.52.14

Screen Shot 2016-06-23 at 18.52.21

Screen Shot 2016-06-23 at 18.52.33.png

before adding some negative numbers into the mix:

Screen Shot 2016-06-23 at 18.52.46

Here are some more to practice:

Some more ideas for this topic on Resourceaholic here.

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