Because the system is based on counting in blocks of ten.
A medium large number is represented as a number of thousands (10*10*10)
plus a number of hundreds (10*10)
plus a number of tens (10)
plus some units.
Numbers that are larger still would involve ten thousands (10*10*10*10 or 104), or hundred thousands (105), millions (106), etc.
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Our number system is based on the number ten, and as a result, it is called the decimal system.
The Decimal System.
decimal
Decimal refers to ten and the number system is based on counting in tens. The system is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right.
Deci- means ten So it is decimal system.