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  2. Divisibility rule - Wikipedia

    en.wikipedia.org/wiki/Divisibility_rule

    Subtract the quantity of the digits 2, 5, and 8 in the number from the quantity of the digits 1, 4, and 7 in the number. The result must be divisible by 3. Using the example above: 16,499,205,854,376 has four of the digits 1, 4 and 7 and four of the digits 2, 5 and 8; since 4 − 4 = 0 is a multiple of 3, the number 16,499,205,854,376 is ...

  3. Division (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Division_(mathematics)

    In terms of partition, 20 / 5 means the size of each of 5 parts into which a set of size 20 is divided. For example, 20 apples divide into five groups of four apples, meaning that "twenty divided by five is equal to four". This is denoted as 20 / 5 = 4, or ⁠ 20 / 5 ⁠ = 4. [2] In the example, 20 is the dividend, 5 is the divisor, and 4 is ...

  4. Calculator - Wikipedia

    en.wikipedia.org/wiki/Calculator

    To perform the calculation 25 + 9, one presses keys in the following sequence on most calculators: 2 5 + 9 =. When 2 5 is entered, it is picked up by the scanning unit; the number 25 is encoded and sent to the X register; Next, when the + key is pressed, the "addition" instruction is also encoded and sent to the flag or the status register;

  5. Division by two - Wikipedia

    en.wikipedia.org/wiki/Division_by_two

    An orange that has been sliced into two halves. In mathematics, division by two or halving has also been called mediation or dimidiation. [1] The treatment of this as a different operation from multiplication and division by other numbers goes back to the ancient Egyptians, whose multiplication algorithm used division by two as one of its fundamental steps. [2]

  6. 1,000,000,000 - Wikipedia

    en.wikipedia.org/wiki/1,000,000,000

    (10 9 days is roughly 2.738 million years.) About 10 9 months ago, dinosaurs walked the Earth during the late Cretaceous. (10 9 months is roughly 83.3 million years.) About 10 9 years—a gigaannus—ago, the first multicellular eukaryotes appeared on Earth. About 10 9 decades ago, the thin disk of the Milky Way started to form. (10 9 decades ...

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  8. 1,000,000 - Wikipedia

    en.wikipedia.org/wiki/1,000,000

    The million is sometimes used in the English language as a metaphor for a very large number, as in "Not in a million years" and "You're one in a million", or a hyperbole, as in "I've walked a million miles" and "You've asked a million-dollar question". 1,000,000 is also the square of 1000 and also the cube of 100.

  9. Billion - Wikipedia

    en.wikipedia.org/wiki/Billion

    1000 million Mark Notgeld banknote (1923) of Frankfurt am Main. According to the Oxford English Dictionary, the word billion was formed in the 16th century (from million and the prefix bi-, "two"), meaning the second power of a million (1,000,000 2 = 10 12). This long scale definition was similarly applied to trillion, quadrillion and so on ...