202 1- 10-05 can the math teacher draw by hand?

Yesterday, I posted an article "Teachers Should Have Unique Skills". Teacher Xiong called me this afternoon and told me a story: once in a provincial experimental middle school, a math teacher was going to open an open class. At that time, a Chinese teacher asked, in order to make the class shine, can the teacher shine in the class and let the students shine? So, in the open class, the math teacher performed a unique skill: "Drawing a circle by hand", which should be said to be quite round.

However, when commenting on the class, the math teachers and researchers who attended the class together questioned: math teaching students is rigorous, not taken for granted, and has no scale. How to judge that the diameter of the circle you draw is 15 cm, and there is no compass? How do you judge this is a circle? As a math teacher, drawing a map is different from a geography teacher. Such an operation can easily mislead students.

In the past ten years, when we were in school, it was right and understandable for teachers to do that. Now that the concept has changed, it is easy to have a bad influence on students.

This short story of Mr. Xiong made me feel awakened. I suddenly thought of some details of my previous school days.

02

Physics teacher's on-site homework

When I was in junior high school, the classroom lighting used fluorescent lamps with jumping bulbs, which often burned out. I need to ask the logistics department to turn off the main switch, replace the jumping light bulb and push it on. The physics teacher said that you can actually start the fluorescent lamp without jumping. Without turning on the switch, the physics teacher went to work with electricity, directly removed the beating bubbles, and quickly wiped the two wire ends together, and the fluorescent lamp lit up. Not once. Wipe both threads several times. Soon, I also learned this skill. As long as the fluorescent lamp doesn't work, I jump on the table, wipe it with two wires, and watch the sparks splash without fear. The physics teacher also told us that if you stand on a stool and touch only one wire at a time, it doesn't matter, because you can't make a circle. He took a nail, stood on the stool and plugged it directly into the socket. We exclaimed that the physics teacher had pulled out the nail again.

One day, we went to clean the office and found a nail. I followed the example of a physics teacher, standing on a wooden stool and inserting a nail into the socket, and I didn't feel anything. Suddenly, the classmate next to me gave me a hand. I felt my arm numb, so I fell off the stool and tasted the taste of being electrocuted for the first time.

The PE teacher steps on basketball.

Once in physical education class, the PE teacher gave us a unique trick: stand on the basketball with both feet, and the basketball won't roll. We were shocked and thought that our wife was too powerful. I want to try it when I get home in the afternoon. I put one foot on myself first, and when I feel all right, I put the other foot on the basketball. Before I came to my senses, I fell to the ground with a bang, and the back of my head hit the ground heavily, and my head lost consciousness with a bang. It took me a long time to recover, and Venus was still in front of me. A seemingly simple skill must be very skillful.

03

Showing off your talents should be based on scientific rigor and safety.

Primary and secondary school teachers are facing minors, and the dangers of their actions are unpredictable. Simple imitation is prone to danger. Mathematics class requires rigor and science. All paintings are required to be completed with a ruler, and the teacher draws one casually, which looks very chic. Students are easy to imitate, and some think it is more troublesome to draw with a ruler, which leads to irregular drawing.

More importantly, the wrong teaching behavior can easily lead students to develop bad behavior habits, which is contrary to the laws of education.

One year, I want to learn to play the erhu from an old teacher. The old teacher said that if you really want to study, you should buy a good erhu first, about 2500 yuan. I said, I'm not going to be a musician either. I was just having fun. The old teacher said, that won't do. Inferior instruments are wrong in pitch and tone. When noise is preconceived, your sense of hearing and music will be destroyed, and it is difficult to improve and correct it later.

04

postscript

As the saying goes, you can't read the almanac every other year. Now times have changed, and some past practices are out of date. In the past, when parents sent their students to school, they would tell their teachers and beat them if they didn't obey. Being beaten at school, you must never say anything when you go home, or you will be beaten by your parents. Now, even the children of the closest relatives or classmates, you should ask any teacher to strictly discipline you, and never take it seriously. Grasping the bottom line of being a teacher is the most important thing.

Former teachers can do hydrogen explosion experiments in the classroom, and PE teachers can teach us to throw javelins and grenades on the playground. Now, we should act according to the rules and regulations on the premise of ensuring absolute safety and science, not only to ensure the safety of students, but also for our own safety. Because our education and teaching is not to engage in scientific experiments, but not to make any mistakes.

The phenomenon that math teachers draw circles by hand should be taken as a warning.