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  2. Subtraction - Wikipedia

    en.wikipedia.org/wiki/Subtraction

    As an example, suppose that 30% of widgets made in a factory are defective. Six months later, 20% of widgets are defective. The percentage change is ⁠ 20% − 30% / 30% ⁠ = − ⁠ 1 / 3 ⁠ = ⁠−33 + 1 / 3 ⁠ %, while the percentage point change is −10 percentage points.

  3. Divisibility rule - Wikipedia

    en.wikipedia.org/wiki/Divisibility_rule

    Take each digit of the number (371) in reverse order (173), multiplying them successively by the digits 1, 3, 2, 6, 4, 5, repeating with this sequence of multipliers as long as necessary (1, 3, 2, 6, 4, 5, 1, 3, 2, 6, 4, 5, ...), and adding the products (1×1 + 7×3 + 3×2 = 1 + 21 + 6 = 28). The original number is divisible by 7 if and only if ...

  4. Division (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Division_(mathematics)

    In abstract algebra, given a magma with binary operation ∗ (which could nominally be termed multiplication), left division of b by a (written a \ b) is typically defined as the solution x to the equation a ∗ x = b, if this exists and is unique. Similarly, right division of b by a (written b / a) is the solution y to the equation y ∗ a = b ...

  5. Student teams-achievement divisions - Wikipedia

    en.wikipedia.org/wiki/Student_teams-achievement...

    Student teams-achievement divisions (STAD) is a Cooperative learning strategy in which small groups of learners with different levels of ability work together to accomplish a shared learning goal. [1] It was devised by Robert Slavin and his associates at Johns Hopkins University.

  6. Synthetic division - Wikipedia

    en.wikipedia.org/wiki/Synthetic_division

    E.g.: x**2 + 3*x + 5 will be represented as [1, 3, 5] """ out = list (dividend) # Copy the dividend normalizer = divisor [0] for i in range (len (dividend)-len (divisor) + 1): # For general polynomial division (when polynomials are non-monic), # we need to normalize by dividing the coefficient with the divisor's first coefficient out [i ...

  7. US Park Police officer won't be charged in shooting death of ...

    www.aol.com/news/us-park-police-officer-wont...

    On Thursday, the United States Attorney's Office for the District of Columbia said a U.S. Park Police officer who killed a 17-year-old will not face charges.

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