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  2. Chisanbop - Wikipedia

    en.wikipedia.org/wiki/Chisanbop

    With the chisanbop method it is possible to represent all numbers from 0 to 99 with the hands, rather than the usual 0 to 10, and to perform the addition, subtraction, multiplication and division of numbers. [4] The system has been described as being easier to use than a physical abacus for students with visual impairments. [5]

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  4. List of Cyberchase episodes - Wikipedia

    en.wikipedia.org/wiki/List_of_Cyberchase_episodes

    The kids must find the unfair/crooked game to find Digit. Meanwhile, they learn about chance and how to spot an unfair chance of winning and losing. Along the way they meet Lucky, a cab driver, who offers them a chance to gain a free cab ride while they search for Digit. Digit is locked in a bird cage with Buzz and Delete as his guards.

  5. 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.

  6. Trachtenberg system - Wikipedia

    en.wikipedia.org/wiki/Trachtenberg_system

    Some of the algorithms Trachtenberg developed are ones for general multiplication, division and addition. Also, the Trachtenberg system includes some specialised methods for multiplying small numbers between 5 and 13. The section on addition demonstrates an effective method of checking calculations that can also be applied to multiplication.

  7. Multiplication algorithm - Wikipedia

    en.wikipedia.org/wiki/Multiplication_algorithm

    A multiplication algorithm is an algorithm (or method) to multiply two numbers. Depending on the size of the numbers, different algorithms are more efficient than others. Numerous algorithms are known and there has been much research into the topic.

  8. 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.

  9. 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.