1 Square roots and irrational numbers
2 Calculating expressions including roots
3 multiplication formula
4 Factorization
5 Quadratic equations
6 Quadratic functions and graphs
7 Applications of Quadratic Functions

I finished the concept book, but I don't understand the concepts.
There are some problems that are difficult to solve until the end.
Is there a workbook that covers only the concepts in one volume?
I wish they would cover the application problems during the exam or after finishing a concept book...
I'm a little slow at math. Is there a good concept book?
I want to make progress quickly, but the concept books on the market have too many problems to cover, so it's difficult.

For readers who have found the middle school math textbooks on the market inconvenient for various reasons, we have published an easy concept book consisting of only easy problems, from concept understanding to application problems.
If you had difficulty solving all of Check Check Math or other companies' concept books, I recommend Check Check Basic Math.
We have broken down the concepts into very small chunks so that you can study one lecture a day, or two or three lectures a day, depending on your level of understanding, and learn them in a variety of ways.

If you want to solidify your foundation by solving more easy problems, I recommend solving Double Click Math along with Check Check Basic Math.
If you think you have grasped the concepts with Check Check Basic Math, I recommend you try the Type Check N series of past exam questions.
If you want to reinforce the concepts further, we recommend selecting Check Check Math to reinforce the concepts again and try out various types of problems that are not included in Check Check Basic Math.