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2. Benford's law - Wikipedia

   en.wikipedia.org/wiki/Benford's_law

   The distribution of the n-th digit, as n increases, rapidly approaches a uniform distribution with 10% for each of the ten digits, as shown below. [70] Four digits is often enough to assume a uniform distribution of 10% as "0" appears 10.0176% of the time in the fourth digit, while "9" appears 9.9824% of the time.

3. Number - Wikipedia

   en.wikipedia.org/wiki/Number

   In this base 10 system, the rightmost digit of a natural number has a place value of 1, and every other digit has a place value ten times that of the place value of the digit to its right. In set theory, which is capable of acting as an axiomatic foundation for modern mathematics, [34] natural numbers can be represented by classes of equivalent ...

4. Fourth grade - Wikipedia

   en.wikipedia.org/wiki/Fourth_grade

   In math, kids learn about place value up to the millions, prime and composite numbers, multiplying 2-digit and 3-digit numbers, long division, fractions, decimals, the metric system, and geometry. In Social Studies, they learn about geography skills such as map reading and longitude and latitude, state history, and early American history.

5. Academic grading in the United States - Wikipedia

   en.wikipedia.org/wiki/Academic_grading_in_the...

   A-plusses, if given, are usually assigned a value of 4.0 (equivalent to an A) due to the common assumption that a 4.00 is the best possible grade-point average, although 4.33 is awarded at some institutions. In some places, .25 or .3 instead of .33 is added for a plus grade and subtracted for a minus grade.

6. Luhn algorithm - Wikipedia

   en.wikipedia.org/wiki/Luhn_algorithm

   Luhn algorithm. The Luhn algorithm or Luhn formula, also known as the " modulus 10" or "mod 10" algorithm, named after its creator, IBM scientist Hans Peter Luhn, is a simple check digit formula used to validate a variety of identification numbers. It is described in US patent 2950048A, granted on 23 August 1960. [ 1]

7. Washington Assessment of Student Learning - Wikipedia

   en.wikipedia.org/wiki/Washington_Assessment_of...

   On March 26, 2008, Gregoire effectively tossed out the math section of the 10th-grade WASL, largely due to low pass rates and debate over its long list of problems, to be replaced by math tests at the end of classes. The math WASL will count as a graduation requirement in 2011 and then be replaced in 2014 by end-of-course exams.