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  2. 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 + = + and = for every real numbers a and b.

  3. Decimal separator - Wikipedia

    en.wikipedia.org/wiki/Decimal_separator

    A decimal separator is a symbol that separates the integer part from the fractional part of a number written in decimal form. Different countries officially designate different symbols for use as the separator. The choice of symbol can also affect the choice of symbol for the thousands separator used in digit grouping.

  4. Addition - Wikipedia

    en.wikipedia.org/wiki/Addition

    Doubles facts form a backbone for many related facts, and students find them relatively easy to grasp. [ 36 ] Near-doubles : Sums such as 6 + 7 = 13 can be quickly derived from the doubles fact 6 + 6 = 12 by adding one more, or from 7 + 7 = 14 but subtracting one.

  5. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    The apparent plural form in English goes back to the Latin neuter plural mathematica , based on the Greek plural ta mathēmatiká (τὰ μαθηματικά) and means roughly "all things mathematical", although it is plausible that English borrowed only the adjective mathematic(al) and formed the noun mathematics anew, after the pattern of ...

  6. History of mathematics - Wikipedia

    en.wikipedia.org/wiki/History_of_mathematics

    The Tsinghua Bamboo Slips, containing the world's earliest decimal multiplication table, dated 305 BC during the Warring States period. An analysis of early Chinese mathematics has demonstrated its unique development compared to other parts of the world, leading scholars to assume an entirely independent development. [105]

  7. Speed of light - Wikipedia

    en.wikipedia.org/wiki/Speed_of_Light

    This subscripted notation, which is endorsed in official SI literature, [11] has the same form as related electromagnetic constants: namely, μ 0 for the vacuum permeability or magnetic constant, ε 0 for the vacuum permittivity or electric constant, and Z 0 for the impedance of free space. This article uses c exclusively for the speed of light ...

  8. Central processing unit - Wikipedia

    en.wikipedia.org/wiki/Central_processing_unit

    The System/360 Model 65 had an 8-bit adder for decimal and fixed-point binary arithmetic and a 60-bit adder for floating-point arithmetic. [76] Many later CPU designs use similar mixed bit width, especially when the processor is meant for general-purpose use where a reasonable balance of integer and floating-point capability is required.

  9. Abacus - Wikipedia

    en.wikipedia.org/wiki/Abacus

    It adopts the form of the upper deck one bead and the bottom four beads. The top bead on the upper deck was equal to five and the bottom one is similar to the Chinese or Korean abacus, and the decimal number can be expressed, so the abacus is designed as a 1:4 device. The beads are always in the shape of a diamond.

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