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  2. Divisibility rule - Wikipedia

    en.wikipedia.org/wiki/Divisibility_rule

    If the hundreds digit is odd, the number obtained by the last two digits must be 4 times an odd number. 352: 52 = 4 x 13. Add the last digit to twice the rest. The result must be divisible by 8. 56: (5 × 2) + 6 = 16. The last three digits are divisible by 8. [ 2][ 3] 34,152: Examine divisibility of just 152: 19 × 8.

  3. Density - Wikipedia

    en.wikipedia.org/wiki/Density

    Density ( volumetric mass density or specific mass) is a substance's mass per unit of volume. The symbol most often used for density is ρ (the lower case Greek letter rho ), although the Latin letter D can also be used. Mathematically, density is defined as mass divided by volume: [ 1] where ρ is the density, m is the mass, and V is the volume.

  4. Alcohol by volume - Wikipedia

    en.wikipedia.org/wiki/Alcohol_by_volume

    Alcohol by volume (abbreviated as alc/vol or ABV) is a standard measure of the volume of alcohol contained in a given volume of an alcoholic beverage, expressed as a volume percent. [ 1][ 2][ 3] It is defined as the number of millilitres (mL) of pure ethanol present in 100 mL (3.5 imp fl oz; 3.4 US fl oz) of solution at 20 °C (68 °F).

  5. Collatz conjecture - Wikipedia

    en.wikipedia.org/wiki/Collatz_conjecture

    There is a 15 state Turing machine that halts if and only if a conjecture by Paul Erdős (closely related to the Collatz conjecture) is false. Hence if BB(15) was known, and this machine did not stop in that number of steps, it would be known to run forever and hence no counterexamples exist (which proves the conjecture true).

  6. Estimated number of civilian guns per capita by country

    en.wikipedia.org/wiki/Estimated_number_of...

    The actual number of guns per 100 persons may vary to more, with an unestimated number of illegal firearms held by civilians, around to 9 to 15 million.[ 14] ^ Poland.The number of registered firearms in 2017 survey (380k) is taken from official data for the year 2014,[ 15] even if data for the year 2016 (426k) should have been already ...

  7. Ratio - Wikipedia

    en.wikipedia.org/wiki/Ratio

    In mathematics, a ratio ( / ˈreɪʃ ( i) oʊ /) shows how many times one number contains another. For example, if there are eight oranges and six lemons in a bowl of fruit, then the ratio of oranges to lemons is eight to six (that is, 8:6, which is equivalent to the ratio 4:3). Similarly, the ratio of lemons to oranges is 6:8 (or 3:4) and the ...

  8. Matrix (mathematics) - Wikipedia

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

    Matrix (mathematics) An m × n matrix: the m rows are horizontal and the n columns are vertical. Each element of a matrix is often denoted by a variable with two subscripts. For example, a2,1 represents the element at the second row and first column of the matrix. In mathematics, a matrix ( pl.: matrices) is a rectangular array or table of ...

  9. List of Christian denominations by number of members

    en.wikipedia.org/wiki/List_of_Christian...

    Anglican Episcopal Church of Brazil – 0.1 million [ 59] Anglican Church of Mexico – 0.1 million. Church of the Province of South East Asia – 0.1 million. Anglican Church of Korea – 0.1 million [ 60] Spanish Reformed Episcopal Church – 0.005 million. Lusitanian Catholic Apostolic Evangelical Church – 0.005 million.