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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 (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.
Annenberg Foundation
Annenberg Learner: Math in Daily Life: Converting to the Metric System
An introduction to the metric system and converting to the metric system. Provides a table of common conversions and steps for converting a cookie recipe to the metric system.