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2. Multiplication table - Wikipedia

   en.wikipedia.org/wiki/Multiplication_table

   Multiplication table. In mathematics, a multiplication table (sometimes, less formally, a times table) is a mathematical table used to define a multiplication operation for an algebraic system. The decimal multiplication table was traditionally taught as an essential part of elementary arithmetic around the world, as it lays the foundation for ...

3. Pi - Wikipedia

   en.wikipedia.org/wiki/Pi

   t. e. The number π ( / paɪ /; spelled out as " pi ") is a mathematical constant that is the ratio of a circle 's circumference to its diameter, approximately equal to 3.14159. The number π appears in many formulae across mathematics and physics.

4. Pi is 3 - Wikipedia

   en.wikipedia.org/wiki/Pi_is_3

   Pi is 3 is a misunderstanding that the Japanese public believed that, due to the revision of the Japanese Curriculum guideline in 2002, the approximate value of pi (π), which had previously been taught as 3.14, is now taught as 3 in arithmetic education.

5. Multiplication - Wikipedia

   en.wikipedia.org/wiki/Multiplication

   e. Multiplication (often denoted by the cross symbol ×, by the mid-line dot operator ⋅, by juxtaposition, or, on computers, by an asterisk *) is one of the four elementary mathematical operations of arithmetic, with the other ones being addition, subtraction, and division. The result of a multiplication operation is called a product .

6. Product (mathematics) - Wikipedia

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

   Product (mathematics) In mathematics, a product is the result of multiplication, or an expression that identifies objects (numbers or variables) to be multiplied, called factors. For example, 21 is the product of 3 and 7 (the result of multiplication), and is the product of and (indicating that the two factors should be multiplied together).

7. Decade (log scale) - Wikipedia

   en.wikipedia.org/wiki/Decade_(log_scale)

   Decade (log scale) Four powers of 10 spanning a range of three decades: 1, 10, 100, 1000 (10 0, 10 1, 10 2, 10 3) Four grids spanning three decades of resolution: One thousand 0.001s, one-hundred 0.01s, ten 0.1s, one 1. One decade (symbol dec[ 1]) is a unit for measuring ratios on a logarithmic scale, with one decade corresponding to a ratio of ...

8. Real number - Wikipedia

   en.wikipedia.org/wiki/Real_number

   The multiplication of two real numbers a and b produce a real number denoted , or , which is the product of a and b. Addition and multiplication are both commutative , which means that a + b = b + a {\displaystyle a+b=b+a} and a b = b a {\displaystyle ab=ba} for every real numbers a and b .

9. 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 ...