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。

While the "Mental arithmetic of Mass perception" provides the training to image numbers as the volume, the sense of fraction also provides the training to image common fractions as the volume.

The common fraction is also in two kinds i.e.:
Fraction as the series
Fraction as the volume
The fractions, too, should be made able to be imaged as the volume like the whole numbers.
Since the fraction makes you get confused more easily than the whole number, the point is to train yourself by drawing a figure into full details and imaging the figure in your mind as the volume. For this reason, you will be trained to draw a figure consciously even for the problem that can be solved otherwise without drawing the figure.
It’s not exaggeration to say that the fraction is the most important unit of the arithmetic. Let’s try hard to become able to image perfectly.

A sense of fraction