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2. Odometry - Wikipedia

   en.wikipedia.org/wiki/Odometry

   Five digit odometer of a Citroën Acadiane, 1986. Odometry is the use of data from motion sensors to estimate change in position over time. It is used in robotics by some legged or wheeled robots to estimate their position relative to a starting location. This method is sensitive to errors due to the integration of velocity measurements over ...

3. File:Odometer 5.svg - Wikipedia

   en.wikipedia.org/wiki/File:Odometer_5.svg

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4. Counting rods - Wikipedia

   en.wikipedia.org/wiki/Counting_rods

   Counting rods (筭) are small bars, typically 3–14 cm (1" to 6") long, that were used by mathematicians for calculation in ancient East Asia. They are placed either horizontally or vertically to represent any integer or rational number .

5. Odometer - Wikipedia

   en.wikipedia.org/wiki/Odometer

   Next, there is fixed (on the same shaft) a small horizontal wheel (hsiao phing lun) 3.3 inches in diameter and 1 ft in circumference, having 10 cogs 1.5 inches apart. (Engaging with this) there is an upper horizontal wheel (shang phing lun) having a diameter of 3.3 ft and a circumference of 10 ft, with 100 cogs, the same distance apart as those ...

6. Rod calculus - Wikipedia

   en.wikipedia.org/wiki/Rod_calculus

   ⁠ 1 / 3 ⁠ + ⁠ 2 / 5 ⁠ Put the two numerators 1 and 2 on the left side of counting board, put the two denominators 3 and 5 at the right hand side; Cross multiply 1 with 5, 2 with 3 to get 5 and 6, replace the numerators with the corresponding cross products. Multiply the two denominators 3 × 5 = 15, put at bottom right

7. 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 ...