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2. Trachtenberg system - Wikipedia

   en.wikipedia.org/wiki/Trachtenberg_system

   Download as PDF; Printable version ... specialised methods for multiplying small numbers between 5 and 13. ... a kind of pairwise multiplication where two digits are ...

3. Grid method multiplication - Wikipedia

   en.wikipedia.org/wiki/Grid_method_multiplication

   The grid method (also known as the box method) of multiplication is an introductory approach to multi-digit multiplication calculations that involve numbers larger than ten. Because it is often taught in mathematics education at the level of primary school or elementary school , this algorithm is sometimes called the grammar school method.

4. Multiplicative digital root - Wikipedia

   en.wikipedia.org/wiki/Multiplicative_digital_root

   The search for these numbers can be sped up by using additional properties of the decimal digits of these record-breaking numbers. These digits must be sorted, and, except for the first two digits, all digits must be 7, 8, or 9. There are also additional restrictions on the first two digits.

5. Arithmetic - Wikipedia

   en.wikipedia.org/wiki/Arithmetic

   Download as PDF; Printable version ... If the multiplicand is a natural number then multiplication is ... the number π has an infinite number of digits starting with ...

6. Multiplication algorithm - Wikipedia

   en.wikipedia.org/wiki/Multiplication_algorithm

   It requires memorization of the multiplication table for single digits. This is the usual algorithm for multiplying larger numbers by hand in base 10. A person doing long multiplication on paper will write down all the products and then add them together; an abacus-user will sum the products as soon as each one is computed.

7. Multiplication - Wikipedia

   en.wikipedia.org/wiki/Multiplication

   Indeed, multiplication by 3, followed by division by 3, yields the original number. The division of a number other than 0 by itself equals 1. Several mathematical concepts expand upon the fundamental idea of multiplication. The product of a sequence, vector multiplication, complex numbers, and matrices are all examples where this can be seen.