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Chem Tutor
Chem Tutor: Conversions Using Dimensional Analysis
Practice problems with answers for converting units with dimensional analysis.
Khan Academy
Khan Academy: Convert Units (Metrics)
Convert between metric measures of distance, volume, and mass. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
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.