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  2. 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 ...

  3. Positional notation - Wikipedia

    en.wikipedia.org/wiki/Positional_notation

    The most significant digit (10) is "dropped": 10 1 0 11 <- Digits of 0xA10B ----- 10 Then we multiply the bottom number from the source base (16), the product is placed under the next digit of the source value, and then add: 10 1 0 11 160 ----- 10 161 Repeat until the final addition is performed: 10 1 0 11 160 2576 41216 ----- 10 161 2576 41227 ...

  4. 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.

  5. List of types of numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_types_of_numbers

    Decimal: The standard Hindu–Arabic numeral system using base ten. Binary: The base-two numeral system used by computers, with digits 0 and 1. Ternary: The base-three numeral system with 0, 1, and 2 as digits. Quaternary: The base-four numeral system with 0, 1, 2, and 3 as digits.

  6. Decimal separator - Wikipedia

    en.wikipedia.org/wiki/Decimal_separator

    Any such symbol can be called a decimal mark, decimal marker, or decimal sign. Symbol-specific names are also used; decimal point and decimal comma refer to a dot (either baseline or middle ) and comma respectively, when it is used as a decimal separator; these are the usual terms used in English, [ 1 ] [ 2 ] [ 3 ] with the aforementioned ...

  7. Indian mathematics - Wikipedia

    en.wikipedia.org/wiki/Indian_mathematics

    The earliest surviving evidence of decimal place value numerals in India and southeast Asia is from the middle of the first millennium CE. [57] A copper plate from Gujarat, India mentions the date 595 CE, written in a decimal place value notation, although there is some doubt as to the authenticity of the plate. [ 57 ]

  8. Unary numeral system - Wikipedia

    en.wikipedia.org/wiki/Unary_numeral_system

    The unary numeral system is the simplest numeral system to represent natural numbers: [1] to represent a number N, a symbol representing 1 is repeated N times. [2]In the unary system, the number 0 (zero) is represented by the empty string, that is, the absence of a symbol.

  9. Synthetic-aperture radar - Wikipedia

    en.wikipedia.org/wiki/Synthetic-aperture_radar

    There are 2 major approaches for a 3 3 polarimetric matrix decomposition. One is the lexicographic covariance matrix approach based on physically measurable parameters, [ 40 ] and the other is the Pauli decomposition which is a coherent decomposition matrix.