The scale of the cards is called numerical and named. In the first case, the fraction is indicated, the numerator of which is set to unity. The second shows how much length falls on 1 centimeter of the card, a convenient single segment.
For example, if 1 km of terrain is within 5 cm of the map, then the numerical scale will be 1: 20,000, and the named one will sound like 1 cm 200 meters.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.