remove-circle Internet Archive's in-browser video "theater" requires JavaScript to be enabled. It appears your browser does not have it turned on. Please see your ...

These are among the hallmarks of dyscalculia (pronounced dis-kal-KYOO-lee-uh), a learning disorder that hinders students’ ability in math, as they were observed in the classroom by long-time teachers.

In his book The Mathematical Universe, mathematician William Dunham wrote of John Venn’s namesake legacy, the Venn diagram, “No one in the long history of mathematics ever became better known ...