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2. Trachtenberg system - Wikipedia

   en.wikipedia.org/wiki/Trachtenberg_system

   Trachtenberg system. The Trachtenberg system is a system of rapid mental calculation. The system consists of a number of readily memorized operations that allow one to perform arithmetic computations very quickly. It was developed by the Russian engineer Jakow Trachtenberg in order to keep his mind occupied while being in a Nazi concentration ...

3. Killer sudoku - Wikipedia

   en.wikipedia.org/wiki/Killer_Sudoku

   Killer sudoku. Killer sudoku (also killer su doku, sumdoku, sum doku, sumoku, addoku, or samunamupure) is a puzzle that combines elements of sudoku and kakuro. Despite the name, the simpler killer sudokus can be easier to solve than regular sudokus, depending on the solver's skill at mental arithmetic; the hardest ones, however, can take hours ...

4. Order of operations - Wikipedia

   en.wikipedia.org/wiki/Order_of_operations

   Order of operations. In mathematicsand computer programming, the order of operationsis a collection of rules that reflect conventions about which operations to perform first in order to evaluate a given mathematical expression. These rules are formalized with a ranking of the operations. The rank of an operation is called its precedence, and an ...

5. Magic triangle (mathematics) - Wikipedia

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

   [5] (sequence A356808 in the OEIS) Its one modification uses triangular numbers instead of square numbers. (sequence A355119 in the OEIS) Another magic tringle form is magic triangles with triangluar numbers with different summation. In this magic triangles, the sum of the k-th row and the (n-k)-th row is same for all k.

6. TK Solver - Wikipedia

   en.wikipedia.org/wiki/TK_Solver

   Variables in a rule are automatically posted to the Variable Sheet when the rule is entered and the rule is displayed in mathematical format in the MathLook View window at the bottom of the screen. Any variable can operate as an input or an output, and the model [ 8 ] will be solved for the output variables depending on the choice of inputs.

7. Zeller's congruence - Wikipedia

   en.wikipedia.org/wiki/Zeller's_congruence

   Zeller's congruence. Zeller's congruence is an algorithm devised by Christian Zeller in the 19th century to calculate the day of the week for any Julian or Gregorian calendar date. It can be considered to be based on the conversion between Julian day and the calendar date.

8. Romberg's method - Wikipedia

   en.wikipedia.org/wiki/Romberg's_method

   Romberg's method. In numerical analysis, Romberg's method[ 1] is used to estimate the definite integral by applying Richardson extrapolation [ 2] repeatedly on the trapezium rule or the rectangle rule (midpoint rule). The estimates generate a triangular array. Romberg's method is a Newton–Cotes formula – it evaluates the integrand at ...

9. List of University Interscholastic League events - Wikipedia

   en.wikipedia.org/wiki/List_of_University...

   Music Memory (two divisions for grades 3–4 and 5–6) Number Sense (two divisions for grades 4–6 and 7–8) One-Act Play (one division for grades 6–8) Oral Reading (two divisions for grades 4–6 and 7–9) Ready Writing (three divisions for grades 3–4, 5–6, and 7–8) Science I and II (grades 7 and 8, respectively)