How Japanese students multiply

https://www.facebook.com/boredpanda/videos/10156152579969252/?hc_ref=ARTXMYybpWE2_IuPdo3GLf21w2G1boZKPuKg3K5XiI32RoiONetkE0Rdq32cPJTAlQw


lol why didn't they teach us like this! :/ this is very cool knowledge!