"Since subtraction is the inverse of addition,reversibility concepts (as defined by Piaget) may be the most important prerequisites."
I found this section very interesting. I am particularly interested in learning abilities and how student's cognitively develop. It make sense that if a student can't reverse then they will not be ready for subtraction since subtraction is just the reverse of addition. The book says that they normally introduce addition and subtraction at the same time which can lead to confusion. I think that students should be tested individually according to Piaget's standards. However this would be in the perfect school of course. This would be very hard to do as a teacher of 30 plus students along with all the other demands put on teacher however it is the ideal. This would save a lot of frustration if we only knew the reason they are not doing well on their test is not because they can't focus, have ADD, or some other delay. It's just because they are not ready yet!
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