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...
abcteach
Abcteach: Solar System Links
[Free Registration/Login Required] This resource provides several links to elementary information about the Solar System. Students and teachers will find charts, graphs, crossword puzzles, word searches, report forms and more.