How to teach children to learn two-digit MINUS one-digit and integer ten-digit

Students learn on the basis of mastering two digits plus one digit and integer ten, two digits minus one digit subtraction and integer ten. Students are required to know arithmetic, master calculation methods and calculate correctly. Because of the previous foundation and pure calculation, students are definitely not interested. So I first create a situation, present some toys, let the children choose a favorite, give you 8 yuan, how much money is left, and list the formulas. Because the abdication subtraction of two digits minus one digit is based on the learning of non-abdication subtraction, the formulas listed by students are abdication subtraction and non-abdication subtraction. Let the students talk about which questions are easy to calculate, why other questions are difficult to calculate, and draw the conclusion that one digit is not enough. This is abdication subtraction. Not only revealed the topic, but also reviewed the algorithm of non-abdication subtraction, knew the difference between abdication subtraction and non-abdication subtraction, and knew the difficulty of abdication subtraction, why it was not easy to calculate, because the unit was not reduced enough. In the process of saying 36-8= calculation, students have the following algorithm: 36-6-2=28, divide 36 into 20 and 16, and calculate 16 first. There are many algorithms to divide 36 into 10 and 26. First, 10-8=2, then 26+2=28, and so on. , but the expression is not very clear, and middle and junior students don't understand it very well. So I focused on the second method. Here, I will let the whole class work together first. During the investigation, it was found that middle and lower grade students didn't know how to deal with the problem that 6 minus 8 was not enough and needed to borrow from ten people. So I asked the students to stick sticks on the blackboard, explain them while sticking them, and then practice. I think it's better for students to reset it and say what you think. It will be better to strengthen understanding and consolidate the algorithm. In addition, because a few children do not have a solid grasp of the subtraction of abdication within 20 years, they are not skilled in doing sub-questions and are slow and prone to mistakes. For the understanding of numbers, there are still some children who get the numbers wrong from time to time, and even some students actually do subtraction when the decimal places are not enough, which is not enough to understand the meaning of subtraction. Through the study of this class, I understand that teachers should not only pay attention to cultivating students' innovative expression ability, but also pay attention to the learning mastery of underachievers, pay attention to each child group, find and correct their mistakes in time, and strive to make every child feel the joy of success!