"Mathematics Wide Angle" is a newly added unit in the experimental textbook of compulsory education curriculum standards since the first volume of the second grade, and it is a new attempt made by the new textbook in infiltrating mathematical thinking methods into students.

"Wide Angle of Mathematics" is a newly added content in the second volume of the third grade mathematics textbook of compulsory education, which involves the overlapping of mathematics knowledge widely used in daily life. Set theory is the most basic mathematical thought, and set theory can be said to be the foundation of mathematics. Students have been using set thinking method since they studied mathematics.

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The "wide angle of mathematics", such as the learned classification ideas and methods, is actually the basis of set theory. Set is a more systematic and abstract mathematical thinking method. In view of the cognitive level of junior three students, students are only allowed to initially perceive the set ideas through subjects that students can easily understand, and can solve problems in their own way.

Let students find solutions to problems through observation, operation, reasoning, communication and cooperation, feel the diversity and application value of mathematical methods when solving problems, and experience the set idea initially.

Baidu Encyclopedia-What to teach in mathematics wide-angle learning