First of all you have to look at the drawings labeled as a few to several.
Such as (1:50, 1:60) general drawings are mm units that is, for example, 1:50, then the scale above the 1 represents 500mm is 50CM. 1:100, then the 1 above the 1 on behalf of the 1000mm is 1 meter.
Different scales:
Scale: 1:200, length: 1M, line: 5MM.
Scale: 1:100, length: 1M, line: 10MM.
Scale: 1:50, length: 1M, line: 20MM.
Scale: 1:40, length: 1M, line: 25MM: 25MM.
Scale: 1:20, Length: 1M, Line segment: 50MM.
Scale: 1:10, Length: 1M, Line segment: 100MM.
Scale: 1:5, Length: 1M, Line segment: 200MM.
Expanded Information:
Scale is expressed by the formula: scale = distance on the map / actual distance. Scale is usually expressed in three ways.
(1) numerical (also known as digital scale), with a numerical scale or fraction of the size of the scale. For example, 1:50,000,000, or 1/50,000,000.
(2) Line segment (aka scale), where a line segment is drawn on the map and the actual distance represented by 1 centimeter on the map is indicated.
(3) Textual, where 1 centimeter on the map is written directly on the map in text to indicate how many meters of field distance is represented by 1 centimeter on the map, e.g., 1 centimeter on the map is equivalent to a ground distance of 500 meters, or 1 in 50,000.