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2. Vedic square - Wikipedia

   en.wikipedia.org/wiki/Vedic_square

   Vedic square. In Indian mathematics, a Vedic square is a variation on a typical 9 × 9 multiplication table where the entry in each cell is the digital root of the product of the column and row headings i.e. the remainder when the product of the row and column headings is divided by 9 (with remainder 0 represented by 9).

3. Casting out nines - Wikipedia

   en.wikipedia.org/wiki/Casting_out_nines

   Casting out nines. Casting out nines is any of three arithmetical procedures: [1] Adding the decimal digits of a positive whole number, while optionally ignoring any 9s or digits which sum to 9 or a multiple of 9. The result of this procedure is a number which is smaller than the original whenever the original has more than one digit, leaves ...

4. Multiplication table - Wikipedia

   en.wikipedia.org/wiki/Multiplication_table

   Multiplication table. In mathematics, a multiplication table (sometimes, less formally, a times table) is a mathematical table used to define a multiplication operation for an algebraic system. The decimal multiplication table was traditionally taught as an essential part of elementary arithmetic around the world, as it lays the foundation for ...

5. Trachtenberg system - Wikipedia

   en.wikipedia.org/wiki/Trachtenberg_system

   Trachtenberg system. The Trachtenberg system is a system of rapid mental calculation. The system consists of a number of readily memorized operations that allow one to perform arithmetic computations very quickly. It was developed by the Russian engineer Jakow Trachtenberg in order to keep his mind occupied while being in a Nazi concentration camp.

6. The biggest retirement account mistakes, according to experts

   www.aol.com/finance/biggest-retirement-account...

   5. Lack of tax diversification. Relying solely on traditional IRAs or 401 (k)s can lead to a hefty tax bill in retirement. While these accounts offer great up-front tax breaks, ordinary income tax ...

7. Al Roker Celebrates His 70th Birthday with Surprises on the ...

   www.aol.com/al-roker-celebrates-70th-birthday...

   Al Roker is kicking off his seventh decade of life with a bang!. As he turned 70 on Tuesday, Aug. 20, the veteran broadcaster's Today colleagues prepared a surprise celebration for him on the NBC ...