1.
addition
2.
subtraction
3.
Addition and subtraction of three numbers
4.
The relationship between addition and subtraction
5.
Multiplication formula

A unit-by-unit arithmetic reinforcement textbook covering all elementary arithmetic problems.

1.
Complete computational learning in one semester, completed in one volume
2.
Providing a learning diagnostic table for efficient computational learning management
3.
Image association learning that makes computational principles easy and long-lasting to remember
4.
One-page per day composition that never gets pushed back

The answer to mathematical operations = Strong 『Strong Operation』

"Strong Operations" is a textbook designed to help students learn the principles of operations in an easy and fun way through image association learning, and then develop problem-solving skills through practice of how the operations are applied to real life after repeated operation training.
It is a unit-by-unit operation-reinforcement textbook that provides problems in all areas requiring operations, including not only the operation area but also shapes, measurements, regularities, and data, allowing you to completely master the operation learning of the semester in one volume.