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  2. Ninety-nine (trick-taking card game) - Wikipedia

    en.wikipedia.org/wiki/Ninety-nine_(trick-taking...

    Ninety-nine is a card game for 2, 3, or 4 players. It is a trick-taking game that can use ordinary French-suited cards.Ninety-nine was created in 1967 by David Parlett; his goal was to have a good 3-player trick-taking game with simple rules yet great room for strategy.

  3. Casting out nines - Wikipedia

    en.wikipedia.org/wiki/Casting_out_nines

    A trick to learn to add with nines is to add ten to the digit and to count back one. Since we are adding 1 to the tens digit and subtracting one from the units digit, the sum of the digits should remain the same. For example, 9 + 2 = 11 with 1 + 1 = 2.

  4. Chisanbop - Wikipedia

    en.wikipedia.org/wiki/Chisanbop

    The Chisanbop system. When a finger is touching the table, it contributes its corresponding number to a total. Chisanbop or chisenbop (from Korean chi (ji) finger + sanpŏp (sanbeop) calculation [1] 지산법/指算法), sometimes called Fingermath, [2] is a finger counting method used to perform basic mathematical operations.

  5. Trachtenberg system - Wikipedia

    en.wikipedia.org/wiki/Trachtenberg_system

    The method for general multiplication is a method to achieve multiplications with low space complexity, i.e. as few temporary results as possible to be kept in memory. . This is achieved by noting that the final digit is completely determined by multiplying the last digit of the multiplic

  6. Multiplication algorithm - Wikipedia

    en.wikipedia.org/wiki/Multiplication_algorithm

    If a positional numeral system is used, a natural way of multiplying numbers is taught in schools as long multiplication, sometimes called grade-school multiplication, sometimes called the Standard Algorithm: multiply the multiplicand by each digit of the multiplier and then add up all the properly shifted results.

  7. Ninety-nine (addition card game) - Wikipedia

    en.wikipedia.org/wiki/Ninety-nine_(addition_card...

    Ninety-nine is a simple card game based on addition and reportedly popular among the Romani people. [1] It uses one or more standard decks of Anglo-American playing cards in which certain ranks have special properties, and can be played by any number of players.