piagetian task

I did these task on my husband. First I took two balls of playdough and asked him if they were the same size. He said "Yes." Then I smashed on the balls and asked if they were still the same size and he said "Yes." The next task I did was I put two same size pencils on the table. I asked him if they were the same length he said "Yes." I then moved one of them down a little bit so that they were not lined up and asked him if they were the same length now and he said "Yes." I then took two of the same size cups filled equally with water. I asked him if the cups had the same amount of water and he said "Yes." I then poured the water into a taller glass and asked if they had the same amount of water he said "Yes." I figured that he would now the answers to these questions because he is able to reason through them and has already learned these concepts.