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2. 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 ...

3. Try Walmart+ for Free and Save Up to 50% Off This Week Only - AOL

   www.aol.com/try-walmart-free-save-50-210000443.html

   Chefman Rapid Boil Glass Kettle. walmart.com. $25.02. More. Take $100 off the Costway Countertop Microwave Oven. Take $54 off the Cuisinart Air Fryer Toaster Oven. Take $50 off the Ninja CREAMi ...

4. Slide rule - Wikipedia

   en.wikipedia.org/wiki/Slide_rule

   Around 1974, lower-cost handheld electronic scientific calculators started to make slide rules largely obsolete. By 1975, basic four-function electronic calculators could be purchased for less than $50, and by 1976 the TI-30 scientific calculator was sold for less than $25 ($134 adjusted for inflation).

5. The Millionaire (calculator) - Wikipedia

   en.wikipedia.org/wiki/The_Millionaire_(calculator)

   The Millionaire (calculator) The Millionaire Calculator built by Egli around 1910. The Millionaire was the first commercially successful mechanical calculator that could perform a direct multiplication. It was in production from 1893 to 1935 with a total of about five thousand machines manufactured. [1] [2]

6. How to budget with the 50/30/20 rule: A simple, effective ...

   www.aol.com/finance/50-30-20-budgeting-rule...

   Say you earn an income of $2,000 a month. Following the 50/30/20 rule would mean allocating $1,000 to needs, $600 to wants and $400 to savings or high-interest debt. But if your monthly rent and ...

7. Grid method multiplication - Wikipedia

   en.wikipedia.org/wiki/Grid_method_multiplication

   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 ...