In this youtube link, a really cool method to multiply two big numbers is given. Only works of integers. I was wondering if something unconventional and similar to this exists for dividing two big integers? I'm hoping someone from the Japanese schooling system might know since this seems to be primary school stuff there.
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$\begingroup$I've been living in Japan for 15 years. In fact, that method is called "Indian multiplication method" in Japan. Though I don't know whether or not it actually came from India, many people believe so because they usually regard Indians as mathematically talented people. This method is not so common in Japan, yet some cramming schools teach this method for elementary school students. The following link shows another method of multiplication taught in some Japanese cramming schools.
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