Volume E1: Perimeter and Area of ​​Polygons
Perimeter of polygon 1
Area of ​​rectangle 2
Area of ​​a parallelogram and triangle No. 3
Area of ​​rhombus and trapezoid No. 4

Why are shapes difficult in math?
Children who struggle with learning in the area of ​​shapes often have a limited image of shapes, thinking only of stereotypical shapes.
In this case, even if the same shape is flipped or rotated, an error occurs in which it is recognized as a different, separate shape.
Also, because you may learn only with limited images and mistakenly believe that you have formed a concept of shapes.

How can we solve problems without concrete objects?
When a child first expresses a three-dimensional object on a flat surface, he or she needs to directly touch and match concrete objects.
However, geometric skills are not developed solely through activities involving concrete objects.
Through activities of constructing shapes directly, the concept and properties of shapes are recognized in a concrete and intuitive way, and then guessed in the head and justified, and as this process progresses, geometric thinking gradually develops, making it possible to do so through mental manipulation alone without any concrete objects.

So how should I study?
Before starting to learn about shapes, we prepare students for self-directed learning by stimulating interest and motivation. Then, we help them intuitively form concepts related to the topic through visual recognition and provide various examples so that concepts are not limited to stereotypical shapes and locations.
Next, you can apply and utilize the concepts you have learned through various problems to improve your mathematical thinking skills and solidify the concepts. You can also check whether the correct concepts have been formed and improve your spatial sense through specific manipulations and mental manipulation activities such as drawing, measuring, and moving.
Finally, build on what you've learned by taking your skills to the next level with challenging problems that will enhance your critical thinking and problem-solving skills.

This five-step learning process of [Preparation → Concept → Practice → Operation → Challenge] will help you properly improve your shape skills.

Perfect your shape skills! "Red Shapes"'s 5-step shape learning system will take care of it for you.

Textbook composition
Consists of 6 stages in total, 3 volumes per stage
E1 Perimeter and area of ​​polygons
E2 Congruence and Symmetry
E3 rectangular solid / stacking blocks