Cut the small color blocks separately, then put the white backplane directly under the odd pages, put the corresponding colors on the white backplane according to the content, and then open the next page (even pages), and the backplane moves directly below the even pages, corresponding to the colors above, indicating correctness, and vice versa.

Extended data:

The characteristic of Montessori's mathematics education is that it breaks the traditional method of simply teaching children to learn "number". Based on sensory education, it strengthens the exercise of children's logical thinking ability and helps children improve their abstract thinking ability of mathematical analysis, induction and synthesis through the cultivation of sensory pairing, sequence and classification.

The ultimate goal of mathematics education is not only to learn some calculation methods, but more importantly, to improve children's logical thinking ability, enhance children's ability to work independently and make children become independent and intelligent people in the future through mathematics learning and drills.

References:

Baidu encyclopedia-Montessori