6th graders have been working through the logistics of a trip to Mars.  This has led to the realization that everyone needs to communicate measurements, calculations, and other values using a common system of measurement.  After a discussion of units of measure, it was decided that the metric system will be the best way of expressing values.  Students have started exploring the metric system and doing unit conversions.  By the end of the week students will be able to do a wide range of unit conversions, and will be able to describe the metric system and how it works.