B-MAT(ビーマット) | ２つの「考える」で学力センスを鍛えるためのシステムです。

Paper folding is a material that develops "a sense of symmetry" which is one of the important elements in a sense of flatness. Since a sense of flatness is just not only necessary to solve a question about plane figures, but also becomes a fundamental sense of the spatial perception, you are recommended to work on it hard. Additionally, 3 important things in a sense of flatness are as follows.

Additionally, 3 important things in a sense of flatness are as follows.
1)A sense of parallel translation・・・[Sketch of the point]...
2)A sense of symmetry・・・[Paper folding]...
3)A sense of rotation・・・[Turn]...

If you cannot get better (cannot image) on a computer screen, as well as other training, tray the "With actual thing => in your head => with actual thing => in your head" approach again and again.

If you cannot prepare a real object, a drawing can be a substitution. However, since it is easy to prepare the real one, make one with a paper and scissors and check how it will be.
It is not necessarily to be identical with the one on the screen. Fold a paper into the shape on the screen first, then cut it as you like. Afterwards, draw an unfolded shape of it using the imagination, then open the paper you made to check.
If you have become possible to do this in some degree, try it on a computer screen.
The shorter the time becomes, the higher the sense is developed.

A sense of symmetry which forms the basis of the spatial perception