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The '''decimal''' numbering system consists of digits consisting of numbers '''0''' to '''9'''. The numbering system is based on sums of the power of 10 which provides rules for mathematic calculations.
The fact that '''humans ''' started counting on their fingers and thumbs most likely lead to the development of this numbering system.
Referring to the diagram to the right, the value of each decimal digit consists of the value (placeholder) multiplied by the corresponding power of 10. For example, '''units''' are '''10<sup>0</sup>''', '''tens''' are '''10<sup>1</sup>''', '''hundred''' are '''10<sup>2</sup>''' which move in a '''right-to-left''' direction.
