Although counting with knots may seem alien and impractical to people living in the 21st century, using a quipu isn’t as confusing as it appears. Because the strings are arranged vertically ...

In societies with complex number systems, there were clues to how those systems developed. Significantly, Overmann noted that it was common for these societies to use quinary (base 5), decimal or ...

This finger-counting technique transforms hands into sophisticated calculation devices. The right hand represents units (1-9) whilst the left represents tens (10-90), allowing rapid arithmetic ...