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  2. Positional notation - Wikipedia

    en.wikipedia.org/wiki/Positional_notation

    A digit's value is the digit multiplied by the value of its place. Place values are the number of the base raised to the nth power, where n is the number of other digits between a given digit and the radix point.

  3. Vigesimal - Wikipedia

    en.wikipedia.org/wiki/Vigesimal

    In a vigesimal place system, twenty individual numerals (or digit symbols) are used, ten more than in the decimal system. One modern method of finding the extra needed symbols is to write ten as the letter A, or A 20, where the 20 means base 20, to write nineteen as J 20, and the numbers between with the corresponding letters of the alphabet.

  4. Counting rods - Wikipedia

    en.wikipedia.org/wiki/Counting_rods

    Rod numeral place value from Yongle Encyclopedia: 71,824 Japanese counting board with grids A checker counting board diagram in an 18th-century Japanese mathematics textbook Counting rod numerals in grids in a Japanese mathematic book. Counting rods represent digits by the number of rods, and the perpendicular rod represents five. To avoid ...

  5. Significant figures - Wikipedia

    en.wikipedia.org/wiki/Significant_figures

    with the last significant figures in the ones place, tenths place, ones place, and thousands place respectively. (2 here is assumed not an exact number.) For the first example, the first term has its last significant figure in the thousandths place and the second term has its last significant figure in the ones place. The leftmost or largest ...

  6. Decimal separator - Wikipedia

    en.wikipedia.org/wiki/Decimal_separator

    In the Netherlands and Dutch-speaking Belgium, the points thousands separator is used, and is preferred for currency amounts, but the space is recommended by some style guides, mostly in technical writing. [60] In Estonia, currency numbers often use a dot "." as the decimal separator, and a space as a thousands separator. This is most visible ...

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