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  2. Rhind Mathematical Papyrus - Wikipedia

    en.wikipedia.org/wiki/Rhind_Mathematical_Papyrus

    Problems 1–6 compute divisions of a certain number of loaves of bread by 10 men and record the outcome in unit fractions. Problems 7–20 show how to multiply the expressions 1 + 1/2 + 1/4 = 7/4, and 1 + 2/3 + 1/3 = 2 by different fractions. Problems 21–23 are problems in completion, which in modern notation are simply subtraction problems.

  3. Golden ratio - Wikipedia

    en.wikipedia.org/wiki/Golden_ratio

    3.4 Continued fraction and square root. ... Download as PDF; Printable version; ... "Page proportion 2:3. Margin proportions 1:1:2:3. Text area proportioned in the ...

  4. 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 ...

  5. Monty Hall problem - Wikipedia

    en.wikipedia.org/wiki/Monty_Hall_problem

    With his strategy, the player has a win-chance of at least ⁠ 2 / 3 ⁠, however the TV station plays; with the TV station's strategy, the TV station will lose with probability at most ⁠ 2 / 3 ⁠, however the player plays. The fact that these two strategies match (at least ⁠ 2 / 3 ⁠, at most ⁠ 2 / 3 ⁠) proves that they form the ...

  6. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    [2] [3] Historically, the concept of a proof and its associated mathematical rigour first appeared in Greek mathematics , most notably in Euclid 's Elements . [ 4 ] Since its beginning, mathematics was primarily divided into geometry and arithmetic (the manipulation of natural numbers and fractions ), until the 16th and 17th centuries, when ...

  7. Secondary education in the United States - Wikipedia

    en.wikipedia.org/wiki/Secondary_education_in_the...

    Intermediate school is an uncommon term, and can either be a synonym for middle school (notably as used by the New York City public schools) or for schools that encompass the latter years of elementary education prior to middle school/junior high school, serving grades 3 or 4 through 5 or 6. These can also be called 'upper elementary' schools.

  8. Earth - Wikipedia

    en.wikipedia.org/wiki/Earth

    In 2019, 39 million km 2 (15 million sq mi) of Earth's land surface consisted of forest and woodlands, 12 million km 2 (4.6 million sq mi) was shrub and grassland, 40 million km 2 (15 million sq mi) were used for animal feed production and grazing, and 11 million km 2 (4.2 million sq mi) were cultivated as croplands. [271]

  9. Addition - Wikipedia

    en.wikipedia.org/wiki/Addition

    3 + 2 = 5 with apples, a popular choice in textbooks [1]. Addition (usually signified by the plus symbol, +) is one of the four basic operations of arithmetic, the other three being subtraction, multiplication, and division. [2]

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