60, it's in my social studies textbook so it's for sure!
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Decimal system
The number system that we use today is based on the Hindu-Arabic numeral system.
The decimal system is based on the number ten.
The Octal number system is a numeral system based on the number 8 (as opposed to 10). Interestingly, the cultures that have adopted this system count using the spaces between their fingers instead of the individual fingers themselves.
In the American-based system, 1,000,000,000,000,000 would equal one quadrillion. In the Traditional British system, this would be equal to one thousand billion.