We recently grabbed our buckets of water, our measuring jugs and an armful of various sized containers and attempted to improve our skills in estimating capacity. We first used our existing knowledge to write down our best estimates of how much water each container could hold. Then, we split into groups to complete our measurements and find out just how far away our original understandings were. The goal for this activity wasn’t to be the closest, but for each student to develop a more realistic understanding of estimating capacity. Some were close, some were way out, but in the end all the students felt they had developed their skills.