Khan Academy
Khan Academy: Convert Units Word Problems (Us Customary)
Solve word problems that involve converting between US customary measures of distance, volume, and mass. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Mocomi & Anibrain Digital Technologies
Mocomi: Standard Units of Measurement
Details on the different systems of measurement with fun facts and an activity.
Science Struck
Science Struck: Metric System Chart for Kids
This resource explains the structure of the metric system of measurement; the basic units of measurement for length, volume, and mass; and provides charts for each type of measurement. A chart of customary US units is also given.