Decimal is fractional dingus. Tenths, hundreths, thousandths.
Just nice round numbers.
You have 10 fingers and 10 toes so makes sense to have started counting in base ten.
How long did anyone count on their fingers? A month? Any child goes beyond that quickly. Base ten was a bad idea as there aren't many factors of ten (2, 5) as compared to say 12 (2, 3, 4, 6). Relating to the discussion, it's why seconds and minutes are base 60 (and probably why hours are base 24, 12x2).
Sumerians had base 60 system
Of course any child can, which again is why it's great. Why complicate something unnecessarily?
I was talking about earlier than that though. When humans had the intellect to count/understand numbers. They'd have use the tools they have (hands) as a means to count.
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