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  2. 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.

  3. Arithmetic - Wikipedia

    en.wikipedia.org/wiki/Arithmetic

    Commutativity and associativity are laws governing the order in which some arithmetic operations can be carried out. An operation is commutative if the order of the arguments can be changed without affecting the results. This is the case for addition, for instance, + is the same as +. Associativity is a rule that affects the order in which a ...

  4. 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.

  5. 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 ...

  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. List of countries by total wealth - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by_total...

    Countries by total wealth, 2022 (2023 publication) National net wealth, also known as national net worth, is the total sum of the value of a country's assets minus its liabilities.

  9. Luxembourg - Wikipedia

    en.wikipedia.org/wiki/Luxembourg

    Unemployment is traditionally low, though it reached 6.1% by May 2012 after the Great Recession. [113] In 2011, according to the IMF , Luxembourg was the world's second-richest country, with a per capita GDP on a purchasing-power parity (PPP) basis of $80,119. [ 114 ]

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