《两位数加一位数进位加法》是人教版一年级下册的内容,学生在学之前已掌握了20以内的加减法、100以内两位数加减整十数的计算,所以在学生的知识结构中,已有了位值的概念。我校一位新教师,最近上了《两位数加一位数的进位加法》这节课,设计思路比较大气,学生的活动通过三个层面进行:看数编算式→独立思考并尝试计算→小组汇报、小结计算方法;教师的教学引导分三个层面逐层递进:算法多样化→算法之间的沟通→灵活选 “Two-digit plus one-digit addition” is the content of the first grade of the PEP, students have mastered the addition and subtraction within 20 before the study, double-digit double-digit addition and subtraction of the whole number within 100, In the student’s knowledge structure, there is already a concept of bit values. A new teacher from our school, recently attended the class of “plus-digit plus one-digit addition”. The design concept is quite atmospheric. Students’ activities are conducted through three levels: counting numeration → thinking independently and trying to calculate → group report, summary method of calculation; teacher’s teaching guidance progressively layer by layer on three levels: algorithm diversity → communication between algorithms → flexible selection