When mr gradgrind addresses student sissy jupe he refers to her only as girl number twenty why does he refer to her this way what viewpoint is dickens criticizing by drawing attention to this?

Mr. Gradgrind refers to Sissy as "girl number twenty" to emphasize his belief in treating individuals as numbers or statistics rather than recognizing them as unique individuals. Dickens criticizes the industrial, utilitarian mindset that values facts and figures over empathy and understanding, highlighting the dehumanizing effects of this viewpoint on both children and society as a whole.