In this task, students investigate how many coins will fit around a central coin when they are all of the same denomination, and if there is room left over. The teacher is given a chart of four coin denominations and their diameters, but...

We see numbers everywhere around us - measuring the temperature, counting money, telling the time, etc. The numbers that are used for counting objects are called "natural numbers". This article explains the properties of natural numbers...

The "Reign of Terror" that overtook the Osage Reservation in 1921 is just one chapter in the long story of mistreatment of Native Americans by whites, but is one of the most horrifying. Before the chapter ends, untold dozens of Osage...