1.
Mixed calculations of natural numbers
2.
Yaksu and Bash
3.
Correspondence relationship
4.
Reduce and common fractions
5.
Addition and subtraction of fractions
6.
Perimeter and area of ​​polygons

① After summarizing the core content of each unit, we organize it into questions that ask about orthodox problems and basic principles directly related to each unit, and provide a 'Jump Helper' to solidify the basics.

② You can select representative types of problems from each unit, solve them according to the solution, and then use the confirmation problems to firmly master the representative types.

③ You can prepare for various school exams and competitions by covering a wide range of new types of problems that are covered outside of the curriculum or textbooks.

④ We have carefully selected only the highest level of difficulty problems in the country, especially high-quality problems that can evaluate your problem-solving skills, so you can solve problems without fear even when participating in high-level competitions such as national competitions and the World Mathematical Olympiad.