The%20decimal%20number%20system%2C%20also%20known%20as%20Hindu-Arabic%20or%20Arabic%20number%20system%2C%20is%20a%20positional%20number%20system%20and%20employs%2010%20as%20the%20base.%20It%20requires%20a%20dot%20%28a%20decimal%20point%29%20to%20denote%20the%20the%20numeral%20fractions.%26nbsp%3B

Bases%20are%20the%20number%20of%20units%2C%20or%20numbers%2C%20used%20in%20a%20counting%20system.%20The%20most%20common%20base%20number%20is%2010%2C%20because%20the%20numbers%200%20to%209%20are%20used%20in%20the%20number%20system.%20Base-10%20numbers%20are%20the%20foundation%20of%20all%20math%20work.%26nbsp%3B

In%20a%20base-10%20system%2C%20the%20number%20543.21%20represents%20the%20sum%20%285%20%D7%20102%29%20+%20%284%20%D7%20101%29%20+%20%283%20%D7%20100%29%20+%20%282%20%D7%2010%u22121%29%20+%20%281%20%D7%2010%u22122%29.

%3Ca%20class%3D%22mention%22%20data-mention%3D%22%23Mathematics%22%20data-user-id%3D%22Y1gElMQh8TCG%22%20href%3D%22/topic/mathematics%22%3E%23Mathematics%3C/a%3E%20%3Ca%20class%3D%22mention%22%20data-mention%3D%22%23Science%22%20data-user-id%3D%226RhBHV5lGAXq%22%20href%3D%22/topic/science%22%3E%23Science%3C/a%3E%20%3Ca%20class%3D%22mention%22%20data-mention%3D%22%23Knowledge%22%20data-user-id%3D%2201V5Ncm9q0dG%22%20href%3D%22/topic/knowledge%22%3E%23Knowledge%3C/a%3E%26nbsp%3B