Who has a high level of teaching design?

The teaching design of high ferrule level is as follows:

Teacher: In order to enrich students' extracurricular activities, the school plays hoop games. Please compare the hoop level of the first group 1 and the second group in a class.

Teacher: 1 set 9 times, the second set 5 times. Can you judge who has a high level? Health 1: Because of 9>5, the level of 1 is very high. Health 2: Not necessarily, because we don't know the total. If 1 covers 9 times in 100, and No.2 covers 5 times in 10, the level of No.2 is high.

Teacher: It seems to depend on the number of traps, the number of traps. Show the students that the total number of cycles of 1 and No.2 is "20 times" and "10 times". Teacher: Can we judge who has a high level now? Student 1: Calculate the difference and compare the number of missing sets.

Health 2: That won't do either. For example, the number 1 has been set 10 times, and the number 2 has been set 6 times. The difference between the number of times each person sets in and sets in is 1 time, that is, there is 1 time of sleeve leakage, but their ferrule grades should be different. Health 3: I think the level of No.2 is high, and the number of sets accounts for half, that is, the number of sets accounts for 5/ 10 of the total number of sets. Total number of condom use.

Teacher: Actually, this is what we are looking for. Health: It is equivalent to finding a fraction (or several times) of another number from one number. Teacher: Write the formulas separately and work out two scores. Talk about the meaning of each score.

Health: 9/20 means that the number of times in the set of player 1 accounts for one-twentieth of the total number of times in the set; 5/ 10 means that the number of times the No.2 player is in the group accounts for five tenths of the total number of times in the group (or 1/2), or the number of times the No.2 player is in the group accounts for 0.45 and 0.5 times of the total number of times in the group.

Teacher: Whose ferrule level is high? Can you compare their sizes? Student 1: You can compare it by "half" or by fractions, 9/20 < 10/20, so the ring grade of player No.2 is high. Health 2: You can also convert the component ratio, 0.45 < 0.5, so player 2' s ring level is also high.

Data expansion:

The challenge ring is a traditional game loved by China people. At first, the ring was just a self-entertainment game, but now it is mostly used by manufacturers for commercial activities. In the past, in regular games, boxes of cigarettes, clay dolls, glass teacups, small mirrors, small toys, candy and other items were placed, and a rope was pulled several meters away from these items, and participants had to throw circles outside the rope.

There is a small stick in the right hand and an iron hook tied to the front end. Most people who want to take part in this game are children, so they have to pay for rings first, and each ring is 10 cents and 20 cents. When you get the ring, stand outside the rope, aim at what you want and throw it away. If caught, the item belongs to the thrower.