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  2. Integer - Wikipedia

    en.wikipedia.org/wiki/Integer

    The whole numbers were synonymous with the integers up until the early 1950s. [23] [24] [25] In the late 1950s, as part of the New Math movement, [26] American elementary school teachers began teaching that whole numbers referred to the natural numbers, excluding negative numbers, while integer included the negative numbers.

  3. 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 ...

  4. Glitterex - Wikipedia

    en.wikipedia.org/wiki/Glitterex

    It produces glitter out of metallized polyester film, including holographic glitter, made from embossed material, and iridescent glitter, made from 233 layers of clear film with different levels of refraction. The smallest pieces Glitterex produces are 50 micrometres (0.0020 in) by 75 micrometres (0.0030 in), placing them in the category of ...

  5. Multiplication - Wikipedia

    en.wikipedia.org/wiki/Multiplication

    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. Natural number - Wikipedia

    en.wikipedia.org/wiki/Natural_number

    A natural number can be used to express the size of a finite set; more precisely, a cardinal number is a measure for the size of a set, which is even suitable for infinite sets. The numbering of cardinals usually begins at zero, to accommodate the empty set. ∅ {\displaystyle \emptyset }

  7. Multiplication sign - Wikipedia

    en.wikipedia.org/wiki/Multiplication_sign

    In mathematics, the symbol × has a number of uses, including. Multiplication of two numbers, where it is read as "times" or "multiplied by" [ 1] Cross product of two vectors, where it is usually read as "cross". Cartesian product of two sets, where it is usually read as "cross" [ 6] Geometric dimension of an object, such as noting that a room ...

  8. Retirees: Cut Out These 10 Expenses to Save Over $40K a Year

    www.aol.com/finance/retirees-cut-10-expenses...

    From downsizing their homes to taking up meal planning to slash grocery bills, here are 10 expenses that can help retirees save more than $40K a year. 1. Downsizing Housing. Moving to a smaller ...

  9. Multiplication algorithm - Wikipedia

    en.wikipedia.org/wiki/Multiplication_algorithm

    A multiplication algorithm is an algorithm (or method) to multiply two numbers. Depending on the size of the numbers, different algorithms are more efficient than others. Numerous algorithms are known and there has been much research into the topic. The oldest and simplest method, known since antiquity as long multiplication or grade-school ...

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