无效教学是指在教学过程中,教师的教与学生的学脱钩,从而导致效率极低甚至是零的教学,也叫低效教学。《数学课程标准解读》指出:“数学教学要紧密联系学生的生活实际,从学生的生活经验和已有的知识出发,创设生动有趣的情境,让 Invalid teaching refers to the teaching process, the teacher’s teaching and student learning decoupling, resulting in inefficient and even zero teaching, also known as inefficient teaching. ”Mathematical Curriculum Standards Interpretation“ pointed out: ”Mathematics teaching should be closely linked with the students ’actual life, starting from the students’ life experience and existing knowledge, create vivid and interesting context for