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  2. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    492 is close to 500, which is easy to multiply by. Add and subtract 8 (the difference between 500 and 492) to get 492 -> 484, 500. Multiply these numbers together to get 242,000 (This can be done efficiently by dividing 484 by 2 = 242 and multiplying by 1000). Finally, add the difference (8) squared (8 2 = 64) to the result: 492 2 = 242,064

  3. Addition - Wikipedia

    en.wikipedia.org/wiki/Addition

    Columnar addition – the numbers in the column are to be added, with the sum written below the underlined number. There are also situations where addition is "understood", even though no symbol appears: A whole number followed immediately by a fraction indicates the sum of the two, called a mixed number. [4]

  4. Mixed numbers - Wikipedia

    en.wikipedia.org/?title=Mixed_numbers&redirect=no

    This page was last edited on 23 June 2020, at 13:37 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may ...

  5. Mixed radix - Wikipedia

    en.wikipedia.org/wiki/Mixed_radix

    A standard form for dates is 2021-04-10 16:31:15, which would be a mixed radix number by this definition, with the consideration that the quantities of days vary both per month, and with leap years. One proposed calendar instead uses base 13 months, quaternary weeks, and septenary days. A mixed radix numeral system is often best expressed with ...

  6. Isopsephy - Wikipedia

    en.wikipedia.org/wiki/Isopsephy

    The total number is then used as a metaphorical bridge to other words evaluating the equal number, [2] which satisfies isos or "equal" in the term. Ancient Greeks used counting boards for numerical calculation and accounting, with a counter generically called psephos ('pebble'), analogous to the Latin word calculus , from which the English ...

  7. Abacus - Wikipedia

    en.wikipedia.org/wiki/Abacus

    The abacus was much faster for addition, somewhat faster for multiplication, but Feynman was faster at division. When the abacus was used for more complex operations, i.e. cube roots, Feynman won easily. However, the number chosen at random was close to a number Feynman happened to know was an exact cube, allowing him to use approximate methods ...

  8. List of mythologies - Wikipedia

    en.wikipedia.org/wiki/List_of_mythologies

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Help; Learn to edit; Community portal; Recent changes; Upload file

  9. Donald in Mathmagic Land - Wikipedia

    en.wikipedia.org/wiki/Donald_in_Mathmagic_Land

    Donald in Mathmagic Land is an American live-action animated featurette produced by Walt Disney Productions and featuring Donald Duck.The short was directed by Hamilton Luske (with Wolfgang Reitherman, Les Clark, and Joshua Meador as sequence directors) and was released on June 26, 1959. [1]