How do you do multiplication on abacus?

How do you do multiplication on abacus?

https://www.youtube.com/watch?v=GF6nCmcQ5es

How do you use abacus in English?

https://www.youtube.com/watch?v=SkUdjlQy3rk

How do you do multiplication in English?

https://www.youtube.com/watch?v=O7PiTAGtBNk

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