This morning, I finished my homework and prepared to go out. At this time, my father came over and asked me with a smile: "Son, let me ask you, have you learned to weigh?" "Of course I do!" I answered loudly.

"Well, let me test you." So, dad said, and drew a picture on the paper. Dad said to me, "The actual length of this part is 5 mm, and the distance on the drawing is 10 cm. What do you think is the scale of this painting? " "That's not easy? 10 cm = 100 mm, 5: 100 = 1: 20, "I blurted out the scale of this picture. Dad smiled and said, "Right?" Think about it, what is the meaning of scale? I thought about it and said, "The scale represents the ratio of the distance on the map to the actual distance." "Is that what you want to ask?" Dad asked.

I suddenly realized and said, "I know what's going on. I have calculated the ratio of the actual distance to the distance on the map. " The distance of parts on the drawing is 100 mm, the actual distance is 5 mm, and the scale is 20: 1. "

"That's right!" This is a special scale, which is greater than the previous term and the latter term. The simplified latter term is generally 1. This ratio should be used after the actual object is enlarged. "Son, you can correct your mistakes in time. I am proud of you. "

I am very happy to hear my father's praise.