Presumably because the digits on their hands add up to 10
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There is no decimal number for the binary number 13 because 13 cannot be a binary number.
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.
Decimal.
Every number in our "normal" counting system is a decimal. A decimal number 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. A decimal representation does not require a decimal point or any digits after a decimal point.
It refers to ten. The decimal system is based on counting in tens.