[Junior High School Entrance Exam Math] Place Compensation Problems on the 'Height' of an Area Diagram | A Method to Avoid Tripping Over Signs

"I can do Tsurukame-zan (crane and turtle problems), but I freeze up when it comes to compensation problems." is rare to hear ...

[9th Grade Math] What is a function actually doing? | Thinking about quadratic functions from the correspondence between x and y

What is a function actually doing?”Have you ever heard that question from your child?They know the quadratic function formula ...