Capacity is always difficult for children to understand. I created this years ago to use with my special education children. With this graphic the children can easily memorize what a gallon is made up of. The 2nd and 3rd page has the students draw the graphic until they become familiar. page breaks the gallon down into quarts, pints, and cups. Pages 4 and 5 are practice problems to use in order to master using the capacity graphic.