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  2. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    It may be useful to be aware that the difference between two successive square numbers is the sum of their respective square roots. Hence, if one knows that 12 × 12 = 144 and wish to know 13 × 13, calculate 144 + 12 + 13 = 169. This is because (x + 1) 2 − x 2 = x 2 + 2x + 1 − x 2 = x + (x + 1) x 2 = (x − 1) 2 + (2x − 1)

  3. Latin numerals - Wikipedia

    en.wikipedia.org/wiki/Latin_Numerals

    Et is not used when there are more than two words in a compound numeral: centum trīgintā quattuor. The word order in the numerals from 21 to 99 may be inverted: ūnus et vīgintī. Numbers ending in 8 or 9 are usually named in subtractive manner: duodētrīgintā, ūndēquadrāgintā.

  4. Duodecimal - Wikipedia

    en.wikipedia.org/wiki/Duodecimal

    The duodecimal system, also known as base twelve or dozenal, is a positional numeral system using twelve as its base.In duodecimal, the number twelve is denoted "10", meaning 1 twelve and 0 units; in the decimal system, this number is instead written as "12" meaning 1 ten and 2 units, and the string "10" means ten.

  5. Calculator - Wikipedia

    en.wikipedia.org/wiki/Calculator

    The tube technology of the ANITA was superseded in June 1963 by the U.S. manufactured Friden EC-130, which had an all-transistor design, a stack of four 13-digit numbers displayed on a 5-inch (13 cm) cathode-ray tube (CRT), and introduced Reverse Polish Notation (RPN) to the calculator market for a price of $2200, which was about three times ...

  6. How To Write Numbers in Words on a Check - AOL

    www.aol.com/finance/write-numbers-words-check...

    You put $900 in the number box but accidentally wrote “Nine thousand and 00/100” on the text line. Your bank could legally pay your landlord $9,000. ... there are still times when writing a ...

  7. Non-numerical words for quantities - Wikipedia

    en.wikipedia.org/wiki/Non-numerical_words_for...

    The achievement of, a generally positive feat, three times in a game, or another achievement based on the number three [6] Several: 3+ Three or more but not many. Small gross: 120 Ten dozen (10x12) [7] Great hundred: 120 Ten dozen (10x12) or six score (6x20), also known as long-hundred or twelfty [8] [9] None: 0 Zero Lakh: 100,000

  8. Word of the year - Wikipedia

    en.wikipedia.org/wiki/Word_of_the_year

    The Word of the Year need not have been coined within the past twelve months but it does need to have become prominent or notable during that time. There is no guarantee that the Word of the Year will be included in any Oxford dictionary. The Oxford Dictionaries Words of the Year are selected by editorial staff from each of the Oxford dictionaries.

  9. Word of the Day - Wikipedia

    en.wikipedia.org/wiki/Word_of_the_Day

    Word of the Day may refer to: "Word of the Day" , an episode of Rugrats; The Wiktionary Word of the day; See also. Spanish ...