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  2. Stepped reckoner - Wikipedia

    en.wikipedia.org/wiki/Stepped_reckoner

    There is also a tens-carry indicator and a control to set the machine to zero. The machine can: add or subtract an 8-digit number to/from a 16-digit number, multiply two 8-digit numbers to get a 16-digit result, divide a 16-digit number by an 8-digit divisor. Addition or subtraction is performed in a single step, with a turn of the crank.

  3. Rube Goldberg machine - Wikipedia

    en.wikipedia.org/wiki/Rube_Goldberg_machine

    The Chain Reaction Contraption Contest [6] is an annual event hosted at the Carnegie Science Center in Pittsburgh, Pennsylvania in which high school teams each build a Rube Goldberg machine to complete some simple task (which changes from year to year) in 20 steps or more (with some additional constraints on size, timing, safety, etc.).

  4. Pascaline - Wikipedia

    en.wikipedia.org/wiki/Pascaline

    The first number to be entered to perform a subtraction is the 9's complement of the minuend. For example, if the minuend was 7, it's 9's complement is 2 and this value would be dialled in as with addition. The number 7 will appear in the 9's complement display.

  5. Perfect number - Wikipedia

    en.wikipedia.org/wiki/Perfect_number

    In number theory, a perfect number is a positive integer that is equal to the sum of its positive proper divisors, that is, divisors excluding the number itself. [1] For instance, 6 has proper divisors 1, 2 and 3, and 1 + 2 + 3 = 6, so 6 is a perfect number. The next perfect number is 28, since 1 + 2 + 4 + 7 + 14 = 28.

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  7. Numberblocks - Wikipedia

    en.wikipedia.org/wiki/Numberblocks

    Numberblocks is a British animated television series for preschoolers that debuted on CBeebies on 23 January 2017. The programme was created by Joe Elliot and produced by Alphablocks Ltd with Blue Zoo.

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  9. Abacus - Wikipedia

    en.wikipedia.org/wiki/Abacus

    One Nepōhualtzintzin (91) represented the number of days that a season of the year lasts, two Nepōhualtzitzin (182) is the number of days of the corn's cycle, from its sowing to its harvest, three Nepōhualtzintzin (273) is the number of days of a baby's gestation, and four Nepōhualtzintzin (364) completed a cycle and approximated one year.

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