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  2. Blackstone's Card Trick Without Cards - Wikipedia

    en.wikipedia.org/wiki/Blackstone's_Card_Trick...

    The series of mathematical manipulations results in any given card producing a unique number. The multiplication by 2 and 5 means that the final number is ten times the card's value, plus a fixed 15 (for the addition of 3 and the multiplication by 5) and an additional suit-dependent figure. Thus both suit and value are readily identifiable.

  3. Multiplication table - Wikipedia

    en.wikipedia.org/wiki/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 arithmetic operations ...

  4. Trachtenberg system - Wikipedia

    en.wikipedia.org/wiki/Trachtenberg_system

    Some of the algorithms Trachtenberg developed are ones for general multiplication, division and addition. Also, the Trachtenberg system includes some specialised methods for multiplying small numbers between 5 and 13. The section on addition demonstrates an effective method of checking calculations that can also be applied to multiplication.

  5. Promptuary - Wikipedia

    en.wikipedia.org/wiki/Promptuary

    The following diagram shows the multiplication table for the simple 7: Napier's Promptuary: multiple diagram for digit 7. Complete number strips for the simple 7 and the simple 2 are shown in the following diagram. The lines delineating the triangles have been omitted. Napier's Promptuary: two number strips from the promptuary, for digits 7 and 2

  6. Multiplication algorithm - Wikipedia

    en.wikipedia.org/wiki/Multiplication_algorithm

    In arbitrary-precision arithmetic, it is common to use long multiplication with the base set to 2 w, where w is the number of bits in a word, for multiplying relatively small numbers. To multiply two numbers with n digits using this method, one needs about n 2 operations.

  7. Chisanbop - Wikipedia

    en.wikipedia.org/wiki/Chisanbop

    The Chisanbop system. When a finger is touching the table, it contributes its corresponding number to a total. Chisanbop or chisenbop (from Korean chi (ji) finger + sanpŏp (sanbeop) calculation [1] 지산법/指算法), sometimes called Fingermath, [2] is a finger counting method used to perform basic mathematical operations.

  8. Chemical weapons use in Syria must be investigated, says watchdog

    www.aol.com/news/us-sees-assads-fall-chance...

    Arias said the evolving political landscape in Syria offered an opportunity for the organisation to finally obtain clarifications on the full extent and scope of the Syrian chemical weapons ...

  9. Multiplication - Wikipedia

    en.wikipedia.org/wiki/Multiplication

    Multiplication by a positive number preserves the order: For a > 0, if b > c, then ab > ac. Multiplication by a negative number reverses the order: For a < 0, if b > c, then ab < ac. The complex numbers do not have an ordering that is compatible with both addition and multiplication. [30]

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