I'm pretty sure the other one is you slide the crayon perpendicular to the eraser towards the right and then move the left crayon parallel towards the eraser and make it parallel with the bottom crayon. Does that make sense? The goal post will be turned upside down.
I thought it was 90
2 = 6 (2 x 3)
3 = 12 (3 x 4)
4 = 20 (4 x 5)
5 = 30 (5 x 6)
6 = 42 (6 x 7)
{7 = 56 (7 x 8)}
{8 = 72 (8 x 9)}
9 = 90 (9 x 10)
edited to say the first time a read it I thought 81 but realized I forgot to add a 9 (history is my favorite subject, not a math whiz here )