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  2. Units of paper quantity - Wikipedia

    en.wikipedia.org/wiki/Units_of_paper_quantity

    A quire of paper is a measure of paper quantity. The usual meaning is 25 sheets of the same size and quality: 1 ⁄ 20 of a ream of 500 sheets. Quires of 25 sheets are often used for machine-made paper, while quires of 24 sheets are often used for handmade or specialised paper of 480-sheet reams.

  3. Glossary of mathematical symbols - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    3. Between two groups, may mean that the first one is a proper subgroup of the second one. > (greater-than sign) 1. Strict inequality between two numbers; means and is read as "greater than". 2. Commonly used for denoting any strict order. 3. Between two groups, may mean that the second one is a proper subgroup of the first one. ≤ 1.

  4. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    6 1 2 1 11 4 5 9. and would be written in modern notation as 61 / 4 ⁠, 11 / 5 ⁠, and 2 − ⁠ 1 / 9 ⁠ (i.e., 1 ⁠ 8 / 9 ⁠). The horizontal fraction bar is first attested in the work of Al-Hassār (fl. 1200), [35] a Muslim mathematician from Fez, Morocco, who specialized in Islamic inheritance jurisprudence.

  5. Order of operations - Wikipedia

    en.wikipedia.org/wiki/Order_of_operations

    [2] [3] Thus, in the expression 1 + 2 × 3, the multiplication is performed before addition, and the expression has the value 1 + (2 × 3) = 7, and not (1 + 2) × 3 = 9. When exponents were introduced in the 16th and 17th centuries, they were given precedence over both addition and multiplication and placed as a superscript to the right of ...

  6. Glossary of notaphily - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_notaphily

    Refers to modern U.S. paper currency that measures 6 1/8 x 2 5/8 inches, first issued in 1929. Star note See replacement note above. Suffix Letters that appear after serial numbers (123456ADE). Syngraphics Word coined in 1974 to denote the study and collecting of paper money. Based on the Latin word syngrapha, meaning a written promise to pay.

  7. Photo print sizes - Wikipedia

    en.wikipedia.org/wiki/Photo_print_sizes

    The alternative Super series, denoted SnR, nR Plus or nR+, has an aspect ratio of 3∶2 (or as close as possible) and thus provides a better fit for standard 135 film (35 mm) at sizes of 8 inches or above. 5R is twice the size of a 2R print, 6R twice the size of a 4R print and S8R twice the size of 6R. 4D/6D is a newer size for most consumer ...

  8. Adding machine - Wikipedia

    en.wikipedia.org/wiki/Adding_machine

    To add, for example, the amounts of 30.72 and 4.49 (which, in adding machine terms, on a decimal adding machine is 3,072 plus 449 "decimal units"), the following process took place: Press the 3 key in the column fourth from the right (multiples of one thousand), the 7 key in the column second from right (multiples of ten) and the 2 key in the ...

  9. Printing and writing paper - Wikipedia

    en.wikipedia.org/wiki/Printing_and_writing_paper

    ANSI Standard Paper Sizes ANSI Paper Size Width x Height (mm) Width x Height (in) Aspect Ratio Closest ISO Size A 216 x 279 8.5 x 11.0 1:1.2941 A4 B 279 x 432 11.0 x 17.0 1:1.5455 A3 C 432 x 559 17.0 x 22.0 1:1.2941 A2 D 559 x 864 22.0 x 34.0 1:1.5455 A1 E 864 x 1118 34.0 x 44.0 1:1.2941 A0