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  2. History of ancient numeral systems - Wikipedia

    en.wikipedia.org/wiki/History_of_ancient_numeral...

    In the Etruscan system, the symbol 1 was a single vertical mark, the symbol 10 was two perpendicularly crossed tally marks, and the symbol 100 was three crossed tally marks (similar in form to a modern asterisk *); while 5 (an inverted V shape) and 50 (an inverted V split by a single vertical mark) were perhaps derived from the lower halves of ...

  3. List of prime numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_prime_numbers

    A prime number (or prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself. By Euclid's theorem , there are an infinite number of prime numbers. Subsets of the prime numbers may be generated with various formulas for primes .

  4. Presentation program - Wikipedia

    en.wikipedia.org/wiki/Presentation_program

    LibreOffice Impress, one of the most popular free and open-source presentation programs. In computing, a presentation program (also called presentation software) is a software package used to display information in the form of a slide show.

  5. History of mathematics - Wikipedia

    en.wikipedia.org/wiki/History_of_mathematics

    The Maya numerals for numbers 1 through 19, written in the Maya script In the Pre-Columbian Americas , the Maya civilization that flourished in Mexico and Central America during the 1st millennium AD developed a unique tradition of mathematics that, due to its geographic isolation, was entirely independent of existing European, Egyptian, and ...

  6. List of numbers - Wikipedia, the free encyclopedia

    en.wikipedia.org/wiki/List_of_numbers

    A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.

  7. Microsoft Office - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Office

    Word, Excel, and PowerPoint on the web can all natively open, edit, and save Office Open XML files (docx, xlsx, pptx) as well as OpenDocument files (odt, ods, odp). They can also open the older Office file formats (doc, xls, ppt), but will be converted to the newer Open XML formats if the user wishes to edit them online. Other formats cannot be ...

  8. Microsoft Office 2010 - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Office_2010

    The version number 13 was skipped because of the fear of the number 13. [43] It was previously thought that Office 2010 (then called Office 14) would ship in the first half of 2009. [44] On April 15, 2009, Microsoft confirmed that Office 2010 would be released in the first half of 2010.

  9. Egyptian numerals - Wikipedia

    en.wikipedia.org/wiki/Egyptian_numerals

    Boyer proved 50 years ago [when?] that hieratic script used a different numeral system, using individual signs for the numbers 1 to 9, multiples of 10 from 10 to 90, the hundreds from 100 to 900, and the thousands from 1000 to 9000. A large number like 9999 could thus be written with only four signs—combining the signs for 9000, 900, 90, and ...