National Council of Teachers of Mathematics
The Math Forum: Measurement: Metric Conversions
This lesson plan has a game to help students convert to various linear metric units and learn their abbreviations.
Khan Academy
Khan Academy: Convert Units Word Problems (Metric)
Solve word problems that involve converting between metric measures of distance, volume, and mass, as well as measures of time. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or...