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  2. Chisanbop - Wikipedia

    en.wikipedia.org/wiki/Chisanbop

    36 represented in chisanbop, where four fingers and a thumb are touching the table and the rest of the digits are raised. The three fingers on the left hand represent 10+10+10 = 30; the thumb and one finger on the right hand represent 5+1=6. Counting from 1 to 20 in Chisanbop. Each finger has a value of one, while the thumb has a value of five.

  3. Finger-counting - Wikipedia

    en.wikipedia.org/wiki/Finger-counting

    In senary finger counting (base 6), one hand represents the units (0 to 5) and the other hand represents multiples of 6. It counts up to 55 senary (35 decimal). Two related representations can be expressed: wholes and sixths (counts up to 5.5 by sixths), sixths and thirty-sixths (counts up to 0.55 by thirty-sixths). For example, "12" (left 1 ...

  4. Multiplication algorithm - Wikipedia

    en.wikipedia.org/wiki/Multiplication_algorithm

    A multiplication algorithm is an algorithm (or method) to multiply two numbers. Depending on the size of the numbers, different algorithms are more efficient than others. Numerous algorithms are known and there has been much research into the t

  5. 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.

  6. Finger numbering - Wikipedia

    en.wikipedia.org/wiki/Finger_numbering

    The second finger refers to the middle finger in common English, [8] or when playing string, brass, or woodwind instruments in music. [6] [7] The third finger refers to the ring finger in common English, [9] [10] [11] or in a musical context when referring to string, brass, or woodwind instruments. [6] [7]

  7. Senary - Wikipedia

    en.wikipedia.org/wiki/Senary

    If the right hand is used to represent a unit (0 to 5), and the left to represent the multiples of 6, then it becomes possible for one person to represent the values from zero to 55 senary (35 decimal) with their fingers, rather than the usual ten obtained in standard finger counting. e.g. if three fingers are extended on the left hand and four ...

  8. Trachtenberg system - Wikipedia

    en.wikipedia.org/wiki/Trachtenberg_system

    3.6 Multiplying by 6. 3.7 Multiplying by 7. ... 2 Finger method. ... Half of 9's neighbor is 1, plus 5 because 9 is odd, is 6.

  9. Finger binary - Wikipedia

    en.wikipedia.org/wiki/Finger_binary

    Finger binary is a system for counting and displaying binary numbers on the fingers of either or both hands. Each finger represents one binary digit or bit. This allows counting from zero to 31 using the fingers of one hand, or 1023 using both: that is, up to 2 5 −1 or 2 10 −1 respectively.