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2. Calculator - Wikipedia

   en.wikipedia.org/wiki/Calculator

   Fractions such as 1 ⁄ 3 are displayed as decimal approximations, for example rounded to 0.33333333. Also, some fractions (such as 1 ⁄ 7, which is 0.14285714285714; to 14 significant figures) can be difficult to recognize in decimal form; as a result, many scientific calculators are able to work in vulgar fractions or mixed numbers.

3. 8 - Wikipedia

   en.wikipedia.org/wiki/8

   By Mihăilescu's Theorem, it is the only nonzero perfect power that is one less than another perfect power. 8 is the first proper Leyland number of the form x y + y x, where in its case x and y both equal 2. [4] 8 is a Fibonacci number and the only nontrivial Fibonacci number that is a perfect cube. [5] Sphenic numbers always have exactly eight ...

4. Rule of 72 - Wikipedia

   en.wikipedia.org/wiki/Rule_of_72

   Thus at 3.5% inflation using the rule of 70, it should take approximately 70/3.5 = 20 years for the value of a unit of currency to halve. [1] To estimate the impact of additional fees on financial policies (e.g., mutual fund fees and expenses, loading and expense charges on variable universal life insurance investment portfolios), divide 72 by ...

5. Grading systems by country - Wikipedia

   en.wikipedia.org/wiki/Grading_systems_by_country

   Thus, it is now divided between 4, the failing grade, and 5–10, the succeeding grades. Upper secondary school has the same grades for courses and course exams as a comprehensive school but matriculation examination grades are in Latin. Universities and vocational institutions use a scale of 0 (fail) and 1–5 (pass) or fail/pass.