The decimal system is based on the number ten.
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decimal
Ten.
base ten
The number system that uses a base of 10 and the valid numbers are 0 to 9 is the decimal system.
The decimal number system uses 10 different symbols to represent a number. The 10 different symbols are 0 to 9. It is a base 10 system unlike binary which is base 2 ( 0 and 1).