Lattice

Shabakh also know as lattice is a method of multiplication that uses a lattice to multiply two numbers. It was invented by Al-Khwarizmi in the 9^th century and brought to Europe by Fibonacci. He was Persian mathematician, astronomer and geographer. His contributions had a great impact on language. Algebra is derived from al-jabr, one of the two operations he used to solve quadratic equations.

So Lattice is a grid that is drawn up, and each box is split diagonally. The first and second numbers are positioned along the top and right of the lattice respectively, with each number being above a column or next to a row.

All the boxes are filled in this manner, the diagonals are added from right to left, bottom to top t=with the numbers added and written where the diagonal leads.