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Reference.org
Lattice multiplication
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<p>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 <a href="/facts/Multiplication/VtcUjpNv">multiplication</a> that uses a <a href="/facts/Lattice_(group)/2ls9Iv9N">lattice</a> to multiply two multi-digit numbers. It is mathematically identical to the more commonly used <a href="/facts/Long_multiplication/68xf6EdK">long multiplication</a> algorithm, but it breaks the process into smaller steps, which some practitioners find easier to use. </p><p>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. </p>