Here you can start with any video:

☐ Video 1: Introduction, 5 times 3

☐ Video 2: Generalising red times yellow

☐ Video 3: Rotating the rectangle 

☐ Video 4: Mixed representations and sub rectangles

☐ Video 5: Commutativity, kind of

☐ Video 6: What does multiplying by a red number mean?

☐ Video 7: Another way to see multiplying by red numbers

☐ Video 8: Removing red tiles. 

☐ Video 9: Some generalisations

☐ Video 10: Multiplying zero

☐ Video 11: Summary