Teaching the Metric System in 20 Minutes
As a former teacher in Buffalo, NY, I lived very close to the Canadian border.
Friends of mine taught me how the metric system worked an a quick and easy way.
This resource in turn, will help you be successful in teaching your students.
Included in download is a Grades K-3 version which introduces them to the system and a Grades 4-6 version that includes how to move decimal points when converting within the system.