Students in a math class measured the volume of small cups and counted how many cheerios could fit in each cup. They determined that 312 cheerios fit in a 3.3 inch red cup with a volume of 21.2 cubic inches. To calculate how many cheerios could fit in a classroom, the students divided ratios and multiplied measurements of length, width, and height to find volumes. The student provides examples of using measurements of 3D shapes like boxes and classrooms to calculate volume.