Why wait until midway through the year to begin "volume?" Or, worse yet, wait until "crunch time" right before standardized testing. Instead, introduce the concept to your children today, "feed" them tiny bits at a time, and by the time standardized testing rears its head, your students will be saying, "This is easy! Who said it was going to be hard?""Volume and Visible Cubes" is the first installment in a series of mathematics units relating to volume and geometry designed for grades 3-6 and