① Mixed calculation of natural numbers
1.
Expressions that mix addition and subtraction / multiplication and division
2.
An expression that mixes addition, subtraction, multiplication, and division

② Divisors and multiples
1.
Divisors and multiples
2.
Greatest common divisor and least common multiple

③ Rules and Responses
1.
Learn the rules and responses

④ Reduction and common denominator
1.
Creating Fractions of the Same Size / Simplifying Fractions
2.
Compare fractions and decimals

⑤ Addition and subtraction of fractions
1.
Addition of fractions
2.
Subtraction of fractions

⑥ Perimeter and area of ​​polygons
1.
Finding the perimeter of a polygon and the area of ​​a rectangle
2.
Finding the area of ​​a parallelogram, triangle, rhombus, and trapezoid

· Preparatory study + study plan
We've made it possible to briefly review what you've learned before, check how much you need to study, and create a study plan.


· Concept organization
We have broken down the textbook concepts into smaller sections to make them easier to understand and organize in a three-dimensional manner.


· Operational problems + concept check
It consists of very simple and easy calculation problems that help you thoroughly learn the concepts.
To ensure you don't forget the concept, we've made it possible for you to review the concept once more.

· Sentence operation problems
We have organized the most difficult word problems into representative types so that you can focus on solving them and practice repeatedly.
By checking hints, you will be able to practice finding the key words you need to check in the problem.


· Unit summary questions
It is designed to enable students to prepare for real-life exams using the same format of questions as they would for school exams.