What are the famous sayings of Piaget and Vygotsky? Common lectures on primary school mathematics?

1, all intellectual work depends on interest.

2. Children's concept of numbers cannot be directly taught by adults.

Vygotsky

At this time, children have entered a world of diffusion and generalization, all features are drifting, and unconsciously one feature is transformed into another. There is no fixed outline here, but infinite compounds play a leading role here, and the various connections they connect are amazing.