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2. Pre-algebra - Wikipedia

   en.wikipedia.org/wiki/Pre-algebra

   Pre-algebra is a common name for a course taught in middle school mathematics in the United States, usually taught in the 6th, 7th, 8th, or 9th grade. [1] The main objective of it is to prepare students for the study of algebra. Usually, Algebra I is taught in the 8th or 9th grade. [2]

3. Fraction - Wikipedia

   en.wikipedia.org/wiki/Fraction

   To explain the process, consider one third of one quarter. Using the example of a cake, if three small slices of equal size make up a quarter, and four quarters make up a whole, twelve of these small, equal slices make up a whole. Therefore, a third of a quarter is a twelfth. Now consider the numerators.

4. Hilbert's fifth problem - Wikipedia

   en.wikipedia.org/wiki/Hilbert's_fifth_problem

   Hilbert's fifth problem is the fifth mathematical problem from the problem list publicized in 1900 by mathematician David Hilbert, and concerns the characterization of Lie groups. The theory of Lie groups describes continuous symmetry in mathematics; its importance there and in theoretical physics (for example quark theory ) grew steadily in ...

5. Order of operations - Wikipedia

   en.wikipedia.org/wiki/Order_of_operations

   For example, multiplication is granted a higher precedence than addition, and it has been this way since the introduction of modern algebraic notation. [ 2 ] [ 3 ] Thus, in the expression 1 + 2 × 3 , the multiplication is performed before addition, and the expression has the value 1 + (2 × 3) = 7 , and not (1 + 2) × 3 = 9 .

6. Parallel postulate - Wikipedia

   en.wikipedia.org/wiki/Parallel_postulate

   If the sum of the interior angles α and β is less than 180°, the two straight lines, produced indefinitely, meet on that side. In geometry, the parallel postulate is the fifth postulate in Euclid's Elements and a distinctive axiom in Euclidean geometry.

7. Outline of algebra - Wikipedia

   en.wikipedia.org/wiki/Outline_of_algebra

   Algebra is one of the main branches of mathematics, covering the study of structure, relation and quantity. Algebra studies the effects of adding and multiplying numbers , variables , and polynomials , along with their factorization and determining their roots .