Our counting system is based on the number 10 (10 fingers).
The main principle of the decimal system is that 10 is considered as a new unit from which point counting starts again. Ten tens is again a new unit. The multiples of 10 are counted by the same systems as 1 to 9.
Remember that no decimal number-system spoken words like twenty three belong to the decimal counting system, 23 belongs to the decimal number notation.
Origins of decimal counting system are hidden - we can see the spread or diffusion of our system because people wanted to trade with us.
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