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  2. ISO 216 - Wikipedia

    en.wikipedia.org/wiki/ISO_216

    Thus, the lengths of JIS B series paper are √ 1.5 ≈ 1.22 times those of A-series paper. By comparison, the lengths of ISO B series paper are 4 √ 2 ≈ 1.19 times those of A-series paper. Any B n paper (according to the ISO standard) can be defined as B n = S × L , where (measuring in metres)

  3. Multiplication table - Wikipedia

    en.wikipedia.org/wiki/Multiplication_table

    Figure 2 is used for the multiples of 2, 4, 6, and 8. These patterns can be used to memorize the multiples of any number from 0 to 10, except 5. As you would start on the number you are multiplying, when you multiply by 0, you stay on 0 (0 is external and so the arrows have no effect on 0, otherwise 0 is used as a link to create a perpetual cycle).

  4. Divisibility rule - Wikipedia

    en.wikipedia.org/wiki/Divisibility_rule

    Take each digit of the number (371) in reverse order (173), multiplying them successively by the digits 1, 3, 2, 6, 4, 5, repeating with this sequence of multipliers as long as necessary (1, 3, 2, 6, 4, 5, 1, 3, 2, 6, 4, 5, ...), and adding the products (1×1 + 7×3 + 3×2 = 1 + 21 + 6 = 28). The original number is divisible by 7 if and only if ...

  5. Two envelopes problem - Wikipedia

    en.wikipedia.org/wiki/Two_envelopes_problem

    If the values of the envelopes are restated as x and 2x, it's much easier to see that, if A were greater, one would lose x by switching and, if B were greater, one would gain x by switching. One does not gain a greater amount of money by switching because the total T of A and B (3x) remains the same, and the difference x is fixed to T/3.

  6. Inch - Wikipedia

    en.wikipedia.org/wiki/Inch

    Subdivisions of an inch are typically written using dyadic fractions with odd number numerators; for example, two and three-eighths of an inch would be written as ⁠2 + 3 / 8 ⁠ ″ and not as 2.375″ nor as ⁠2 + 6 / 16 ⁠ ″. However, for engineering purposes fractions are commonly given to three or four places of decimals and have been ...

  7. Economy of the United States - Wikipedia

    en.wikipedia.org/wiki/Economy_of_the_United_States

    Real GDP grew at a quarterly annualized rate of 2.2% in Q1 2018, 4.2% in Q2 2018, 3.4% in Q3 2018, and 2.2% in Q4 2018; the Q2 rate was the best growth rate since Q3 2014, and the overall yearly GDP growth of 2.9% in 2018 was the best performance of the economy in a decade. [137]

  8. Glossary of engineering: M–Z - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_engineering:_M–Z

    For example, -4, 0, 82, and 178 are even because there is no remainder when dividing it by 2. By contrast, -3, 5, 7, 21 are odd numbers as they leave a remainder of 1 when divided by 2. Parity (physics) In quantum mechanics, a parity transformation (also called parity inversion) is the flip in the sign of one spatial coordinate.

  9. White dwarf - Wikipedia

    en.wikipedia.org/wiki/White_dwarf

    A white dwarf, then, packs mass comparable to the Sun's into a volume that is typically a million times smaller than the Sun's; the average density of matter in a white dwarf must therefore be, very roughly, 1 000 000 times greater than the average density of the Sun, or approximately 10 6 g/cm 3, or 1 tonne per cubic centimetre. [1]