Lattice multiplication
Multiplication algorithm / From Wikipedia, the free encyclopedia
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Lattice multiplication, also known as the Italian method, Chinese method, Chinese lattice, gelosia multiplication,[1] 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.[2]
The method had already arisen by medieval times, and has been used for centuries in many different cultures. It is still being taught in certain curricula today.[3][4]