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  2. Freerice - Wikipedia

    en.wikipedia.org/wiki/Freerice

    Freerice, originally FreeRice, is a website-based application that allows players to donate rice to families in developing countries by playing a multiple-choice quiz game. For every question the user answers correctly, ten grains of rice are donated via the United Nations World Food Programme . There are over 50 categories, including: English ...

  3. 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 ...

  4. 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 ...

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