Dylan uses a standard unit of measurement.
We read the book How Big is a Foot? A king wanted to give his wife, the queen a birthday gift. It was a bed that measured 6 feet by 3 feet. However when the apprentice measured for the bed, he used his own feet which were much smaller than the king's feet. The queen could not fit in her bed. The apprentice realized he needed to use the king's feet to measure for the bed. This bed was perfect for the queen. The students understand that we need to use a standard way of measuring instead of using our own feet. We did this ruler/measuring activity and compared the "bed" we measured off to the bed we made out of paper feet.