NPR's Scott Simon talks to math historian Glen Van Brummelen about his finding that the decimal point appeared in the 1440s, earlier than thought. The decimal point was in use 150 years before ...

The night he realized what he discovered, Squamish mathematics historian and professor Glen Van Brummelen ran up and down the halls of the dorm where he was staying to teach a math camp, looking for ...

The decimal point is 150 years older than historians thought it was, newfound notes from 15th-century Italy reveal. Decimal points are so simple, it seems like they should have existed forever. These ...

The decimal point was invented around 150 years earlier than previously thought, according to an analysis of astronomical tables compiled by the Italian merchant and mathematician Giovanni Bianchini ...

Represent fractions as parts of a set using the decimal fraction one-hundredth (0.01). Practice reading and writing decimals. Explore mixed fractions and decimals. Compare mixed decimals. Understand ...