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  2. Kaktovik numerals - Wikipedia

    en.wikipedia.org/wiki/Kaktovik_numerals

    Decimal values of Kaktovik numbers n n ... 0.000 625: 6 , 48,000 2,400 120 6 . ... as it didn't require writing in sub-tables for multiplying and subtracting the ...

  3. Duodecimal - Wikipedia

    en.wikipedia.org/wiki/Duodecimal

    The duodecimal system, also known as base twelve or dozenal, is a positional numeral system using twelve as its base.In duodecimal, the number twelve is denoted "10", meaning 1 twelve and 0 units; in the decimal system, this number is instead written as "12" meaning 1 ten and 2 units, and the string "10" means ten.

  4. Fourth power - Wikipedia

    en.wikipedia.org/wiki/Fourth_power

    In arithmetic and algebra, the fourth power of a number n is the result of multiplying four instances of n together. So: n 4 = n × n × n × n. Fourth powers are also formed by multiplying a number by its cube.

  5. Minifloat - Wikipedia

    en.wikipedia.org/wiki/Minifloat

    prefix, and with the zero mantissa all bits after the decimal point are zero, meaning this value is interpreted as =. Floating point numbers use a signed zero, so is also available and is equal to positive . 0 0000 000 = 0 1 0000 000 = −0

  6. Multiplication - Wikipedia

    en.wikipedia.org/wiki/Multiplication

    Multiplying numbers to more than a couple of decimal places by hand is tedious and error-prone. Common logarithms were invented to simplify such calculations, since adding logarithms is equivalent to multiplying. The slide rule allowed numbers to be quickly multiplied to about three places of accuracy.

  7. 25 (number) - Wikipedia

    en.wikipedia.org/wiki/25_(number)

    25 is the sum of the five consecutive single-digit odd natural numbers 1, 3, 5, 7, and 9. 25 is a centered octagonal number, [1] a centered square number, [2] a centered octahedral number, [3] and an automorphic number. [4] 25 percent (%) is equal to ⁠ 1 / 4 ⁠. It is the smallest decimal Friedman number as it can be expressed by its own ...

  8. Exponentiation - Wikipedia

    en.wikipedia.org/wiki/Exponentiation

    The positive integer powers 2 n give the number of possible values for an n-bit integer binary number; for example, a byte may take 2 8 = 256 different values. The binary number system expresses any number as a sum of powers of 2, and denotes it as a sequence of 0 and 1, separated by a binary point, where 1 indicates a power of 2 that appears ...

  9. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    Since 9 = 10 − 1, to multiply a number by nine, multiply it by 10 and then subtract the original number from the result. For example, 9 × 27 = 270 − 27 = 243. This method can be adjusted to multiply by eight instead of nine, by doubling the number being subtracted; 8 × 27 = 270 − (2×27) = 270 − 54 = 216.