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  2. Slide rule - Wikipedia

    en.wikipedia.org/wiki/Slide_rule

    A slide rule requires the user to separately compute the order of magnitude of the answer to position the decimal point in the results. For example, 1.5 × 30 (which equals 45) will show the same result as 1 500 000 × 0.03 (which equals 45 000). This separate calculation forces the user to keep track of magnitude in short-term memory (which is ...

  3. Power of two - Wikipedia

    en.wikipedia.org/wiki/Power_of_two

    Visualization of powers of two from 1 to 1024 (2 0 to 2 10) as base-2 Dienes blocks. A power of two is a number of the form 2 n where n is an integer, that is, the result of exponentiation with number two as the base and integer n as the exponent.

  4. Arithmetic - Wikipedia

    en.wikipedia.org/wiki/Arithmetic

    The decimal representation of an irrational number is infinite without repeating decimals. [23] The set of rational numbers together with the set of irrational numbers makes up the set of real numbers. The symbol of the real numbers is . [24] Even wider classes of numbers include complex numbers and quaternions. [25]

  5. Intelligent tutoring system - Wikipedia

    en.wikipedia.org/wiki/Intelligent_tutoring_system

    The Mathematics Tutor (Beal, Beck & Woolf, 1998) helps students solve word problems using fractions, decimals and percentages. The tutor records the success rates while a student is working on problems while providing subsequent, lever-appropriate problems for the student to work on.

  6. Programme for International Student Assessment - Wikipedia

    en.wikipedia.org/wiki/Programme_for...

    UK disqualified from data analysis, due to its low response rate. [33] Also included test in problem solving. 2006 Science 30 27 400,000 Reading scores for US disqualified from analysis due to misprint in testing materials. [34] 2009 [35] Reading 34 41 + 10 470,000 10 additional non-OECD countries took the test in 2010. [36] [37] 2012 [38 ...

  7. Dark energy - Wikipedia

    en.wikipedia.org/wiki/Dark_energy

    The "cosmological constant" is a constant term that can be added to Einstein field equations of general relativity.If considered as a "source term" in the field equation, it can be viewed as equivalent to the mass of empty space (which conceptually could be either positive or negative), or "vacuum energy".

  8. Cocoa bean - Wikipedia

    en.wikipedia.org/wiki/Cocoa_bean

    The cocoa bean, also known simply as cocoa (/ ˈ k oʊ. k oʊ /) or cacao (/ k ə ˈ k aʊ /), [1] is the dried and fully fermented seed of Theobroma cacao, the cacao tree, from which cocoa solids (a mixture of nonfat substances) and cocoa butter (the fat) can be extracted.

  9. List of Indian inventions and discoveries - Wikipedia

    en.wikipedia.org/wiki/List_of_Indian_inventions...

    A dot, rather than a blank, was first seen to denote zero, in a decimal system, in the Bakhshali manuscript. [166] The usage of the zero in the Bakhshali manuscript was dated from between 3rd and 4th centuries, making it the earliest known usage of a written zero, in a decimal place value system. [167]

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