Illustrative Mathematics
Eratosthenes and the Circumference of the Earth
The class gets to practice being a mathematician in ancient Greece, performing geometric application problems in the way of Eratosthenes. After following the steps of the great mathematicians, they then compare the (surprisingly...
Curated OER
A Look At Rocks
Students write letters to organizations, such as United States Geological Society, to find out more about rocks. Students write about a pretend time they found a magic pebble. Students calculate distances to travel to see various...