1, the thinking of the position system: For example, in the first grade, counting a handful of beans requires units such as "ten" and "hundred"-

2, the idea of transformation; New knowledge is generally transformed into learned knowledge to explore, and there are too many such examples in learning.

3. Diversified algorithms; Each algorithm is a student's "invention", and different people have different understandings of different algorithms. As long as he thinks that what is good is good, the teacher should not impose interference, so this example will not be cited.

Step 4 explore ideas