Quantitative correspondence in the range of 2 10

3 Quantity change (more 1 less 1)

The relationship between quantity (size, height, weight and quantity) belongs to quantity.

5 quantity conservation (length conservation. For example, a rope looks short after bending, but its length has not changed)

Division and combination of numbers within 6 10

In fact, children's mathematics, number, quantity, shape and spatial logic reasoning are all included.