Chinese Multiplication (Lattice Method
Lattice multiplication | Multiplication and division | Arithmetic | Khan Academy
Introduction to lattice multiplication Watch the next lesson: https://www.khanacademy.org/math/arithmetic/multiplication-division/lattice_multiplication/v/wh...
This video is mostly a straight up guide.
Have any of you heard of this before now, because I certainly hadn't.
Some further reading
Lattice multiplication - Wikipedia
Lattice multiplication, also known as the Italian method, Chinese method, Chinese lattice, gelosia multiplication, sieve multiplication, shabakh, Diagonally or Venetian squares, is a method of multiplication that uses a lattice to multiply two multi-digit numbers. It is mathematically identical to the more commonly used long multiplication algorithm, but it breaks the process into smaller steps, which some practitioners find easier to use.
Further Guide: http://www.education.vic.gov.au/school/teachers/teachingresources/discipline/maths/continuum/Pages/latticemulti.aspx This one says that this method comes from Italy and was introduced by Fibonacci! Despite it being called frequently the "Chinese Window" style of multiplication, so some conflicting theories.
More conflicting backgroud: http://rationalmathed.blogspot.co.uk/2007/10/who-invented-lattice-multiplication.html So bits of this text say it originated from India?
Who Invented "Lattice Multiplication"?
I can't seem to get the issue of lattice multiplication off my mind. The negative reactions to this perfectly sound algorithm are not ground...
Please tell if I'm living in the Stone Age with this, since I've only just discovered it.