Unlike Roman, Maya or Iñupiaq numerals, this isn’t a total reimagining of numbers. Instead, it’s an uncanny parallel universe. Any number without zeros retains its old appearance (1,776 is still 1,776 ...

Wow was I wrong. I thought perhaps a few hundred Minnesota youngsters participated in the state’s Math League, and maybe 15-20 high schools. Way off.

From interactive calculators to skill-building games, these digital tools can help make math more accessible and engaging for ...