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  2. Divisibility rule - Wikipedia

    en.wikipedia.org/wiki/Divisibility_rule

    The result is the same as the result of 40 divided by 5(40/5 = 8). If the last digit in the number is 5, then the result will be the remaining digits multiplied by two, plus one. For example, the number 125 ends in a 5, so take the remaining digits (12), multiply them by two (12 × 2 = 24), then add one (24 + 1 = 25).

  3. List of formulae involving π - Wikipedia

    en.wikipedia.org/wiki/List_of_formulae_involving_π

    where C is the circumference of a circle, d is the diameter, and r is the radius.More generally, = where L and w are, respectively, the perimeter and the width of any curve of constant width.

  4. 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 ...

  5. Amicable numbers - Wikipedia

    en.wikipedia.org/wiki/Amicable_numbers

    A general formula by which some of these numbers could be derived was invented circa 850 by the Iraqi mathematician Thābit ibn Qurra (826–901). Other Arab mathematicians who studied amicable numbers are al-Majriti (died 1007), al-Baghdadi (980–1037), and al-Fārisī (1260–1320).

  6. Long division - Wikipedia

    en.wikipedia.org/wiki/Long_division

    As in all division problems, one number, called the dividend, is divided by another, called the divisor, producing a result called the quotient. It enables computations involving arbitrarily large numbers to be performed by following a series of simple steps. [ 1 ]

  7. 44 (number) - Wikipedia

    en.wikipedia.org/wiki/44_(number)

    In the song "44 Fours" by Jay-Z, he rhymes the words four, for and fore 44 times. This song is a follow-up from the song "22 Two's". Vicks Formula 44 is a cough suppressant. [9] The number of the French department Loire-Atlantique; A blues song, "Forty-Four", also known as "44 Blues" "44 Minutes" is a song by heavy metal band Megadeth [10]

  8. Pi - Wikipedia

    en.wikipedia.org/wiki/Pi

    The first five sexagesimal (base 60) digits are 3;8,29,44,0,47 [40] (see OEIS: A060707) Complex numbers and Euler's identity The association between imaginary powers of the number e and points on the unit circle centred at the origin in the complex plane given by Euler's formula

  9. Modulo - Wikipedia

    en.wikipedia.org/wiki/Modulo

    In computing, the modulo operation returns the remainder or signed remainder of a division, after one number is divided by another, called the modulus of the operation.. Given two positive numbers a and n, a modulo n (often abbreviated as a mod n) is the remainder of the Euclidean division of a by n, where a is the dividend and n is the divisor.