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2. Difference of two squares - Wikipedia

   en.wikipedia.org/wiki/Difference_of_two_squares

   The difference of two squares can also be used in the rationalising of irrational denominators. [2] This is a method for removing surds from expressions (or at least moving them), applying to division by some combinations involving square roots .

3. Lowest common denominator - Wikipedia

   en.wikipedia.org/wiki/Lowest_common_denominator

   The lowest common denominator of a set of fractions is the lowest number that is a multiple of all the denominators: their lowest common multiple. The product of the denominators is always a common denominator, as in: + = + =

4. Irreducible fraction - Wikipedia

   en.wikipedia.org/wiki/Irreducible_fraction

   The irreducible fraction for a given element is unique up to multiplication of denominator and numerator by the same invertible element. In the case of the rational numbers this means that any number has two irreducible fractions, related by a change of sign of both numerator and denominator; this ambiguity can be removed by requiring the ...

5. Subtraction - Wikipedia

   en.wikipedia.org/wiki/Subtraction

   While primarily associated with natural numbers in arithmetic, subtraction can also represent removing or decreasing physical and abstract quantities using different kinds of objects including negative numbers, fractions, irrational numbers, vectors, decimals, functions, and matrices. [2] In a sense, subtraction is the inverse of addition.

6. Division algorithm - Wikipedia

   en.wikipedia.org/wiki/Division_algorithm

   Long division is the standard algorithm used for pen-and-paper division of multi-digit numbers expressed in decimal notation. It shifts gradually from the left to the right end of the dividend, subtracting the largest possible multiple of the divisor (at the digit level) at each stage; the multiples then become the digits of the quotient, and the final difference is then the remainder.

7. − (album) - Wikipedia

   en.wikipedia.org/wiki/%E2%88%92_(album)

   − ("Subtract") is the sixth studio album by English singer-songwriter Ed Sheeran.It was released on 5 May 2023 through Asylum and Atlantic Records.A mostly acoustic album, production was handled by Aaron Dessner on every track, alongside Fred Again, Max Martin and Shellback, who all joined him to help produce lead single "Eyes Closed"; while "Boat" and "Life Goes On" served as the respective ...