The world's oldest known decimal point was discovered in merchant notes from Italy in the 1440s

The decimal point is 150 years older than historians thought, newly discovered observations from 15th-century Italy reveal.

Decimal points are so simple, they seem to have been around forever. These handy math tools break integers into tenths, hundredths, and thousandths, making calculations much easier than doing math with fractions. Some versions of decimals have been around since the 19th century (in Damascus) or the 12th century (in China).

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