Lattice multiplication, also known as gelosia multiplication, sieve multiplication, shabakh, Venetian squares, or the Hindu lattice, is a method of multiplication that uses a lattice to multiply two multi-digit numbers. It is algorithmically the same as regular long multiplication, but it breaks the process into smaller steps, which some practitioners find easier to use.
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.
Read more about Lattice Multiplication: Description, Multiplication of Decimals, History, Derivatives