I am 76 I too looked at the video several times, but my grand d understand it better than I did, she tried to explain them to me - she is 9 years old.

Still trying to understand and study it. I tried to relate the lattice multiplication as I know how to work the abacus way back in high school.

With the assignments and homeworks they bring home everyday I feel and force to learn with the modern methods and technigues of modern education and innovations. Actually I just go with the flow and just try to encourage and reinforce her acquired knowledge.

Time is never boring and goes fast.