The abstraction principle is the last of Gelman and Gallistel’s Five Counting Principles. The one-to-one correspondence, stable-order, cardinal, and order-irrelevance principles have been addressed in previous posts. It is vital that children learn the other principles first, because as they get older, the abstract principle will be easier to understand. The abstraction principle states that… Read More Abstraction Principle – Everything and Anything Can be Counted