Shadow Wolf
Certified People sTabber & Business Owner
I know. I don't post sources without reading them first.From your first link.
Line multiplication is sometimes called stick multiplication, and its origins are unclear, with some source claiming it comes from the Japanese,[1] Chinese,[2] or Vedic cultures.[3] It is basically the same process as the standard multiplication algorithm you are taught in school, except it is represented in a more visual way. Using the intersection of lines or sticks to represent where you multiply various place values, this method might be helpful for those learners who are more visually-oriented.
https://www-wikihow-com.cdn.ampproject.org/v/s/www.wikihow.com/Multiply-Using-the-Line-Method?amp_js_v=a6&_gsa=1&=1&usqp=mq331AQKKAFQArABIIACAw==#aoh=16283041308128&referrer=https://www.google.com&_tf=From %1$s&share=https://www.wikihow.com/Multiply-Using-the-Line-Method