Other
Federal Highway Administration: Si (Modern Metric) Conversion Sheet
Very complete chart of conversion factors for English to SI (metric) unit measurements and SI (metric) to English unit measurements. Includes length, area, volume, mass, temperature, illumination, and force & mass (stress).
PBS
Pbs Kids: Dinosaur Train Bridge Builder
This activity will help children use units to measure length, add two lengths to create a whole, and use words for describing length such as longer and shorter. Sheets of paper become pieces of wood as they construct a bridge for a...