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2. Lattice multiplication - Wikipedia

   en.wikipedia.org/wiki/Lattice_multiplication

   As an example, consider the multiplication of 58 with 213. After writing the multiplicands on the sides, consider each cell, beginning with the top left cell. In this case, the column digit is 5 and the row digit is 2. Write their product, 10, in the cell, with the digit 1 above the diagonal and the digit 0 below the diagonal (see picture for ...

3. Multiplication algorithm - Wikipedia

   en.wikipedia.org/wiki/Multiplication_algorithm

   To multiply two numbers with n digits using this method, one needs about n 2 operations. More formally, multiplying two n-digit numbers using long multiplication requires Θ(n 2) single-digit operations (additions and multiplications).

4. Standard algorithms - Wikipedia

   en.wikipedia.org/wiki/Standard_algorithms

   In this multiplication procedure, "multiply the multiplicand by each digit of the multiplier and then add up all the appropriately shifted results". (West, [3] 2011) To utilize this method, it is necessary to know the basic multiplication table from zero to nine. (West [3] 2011)

5. Promptuary - Wikipedia

   en.wikipedia.org/wiki/Promptuary

   The units digit of this addition, 1, is written down as the next digit of the multiplication result. The tens digit, which is 1, is carried into the next band. The third band from the right has five digits, 2, 4, 3, 1 and 6 plus the carried 1. These are all added to produce 17. The units digit of this, 7, is written as the next digit of the result.

6. Algebra tile - Wikipedia

   en.wikipedia.org/wiki/Algebra_tile

   For instance, if one had x×x, the only algebra tile that would complete the rectangle would be x 2, which is the answer. Multiplication of binomials is similar to multiplication of monomials when using the algebra tiles . Multiplication of binomials can also be thought of as creating a rectangle where the factors are the length and width. [2]

7. Karatsuba algorithm - Wikipedia

   en.wikipedia.org/wiki/Karatsuba_algorithm

   [1] [2] [3] It is a divide-and-conquer algorithm that reduces the multiplication of two n-digit numbers to three multiplications of n/2-digit numbers and, by repeating this reduction, to at most ⁡ single-digit multiplications.