Capacity Man (gallons, quarts, pints, & cups) is an interactive math tool in which students may see for themselves how the 4 customary/standard US liquid measurements are related. As students cut each section out (before gluing), they can lay the 4 quarts, 8 pints, and 16 cups on top of the gallon square and see how they are related.
Students in 3rd - 5th grade have enjoyed this activity for many years. Directions are included.
Currently saved as a PowerPoint, I have yet to try it out on a SMART board, and would love to know if it works well in that venue also.