Evaluation draft of subtraction theme corresponding to ten plus several and ten plus several

Ten plus several and ten plus several corresponding subtraction theme evaluation drafts are as follows:

Many people, especially the older generation, think that children learning mathematics is learning arithmetic. In a narrow sense, they think that mathematics is learning how to calculate. In cities, kindergarten teachers, parents, including children's grandparents, can't wait to teach children how to do math problems. Personally, I feel that the most difficult thing in first-year mathematics is calculation teaching.

Maybe from another angle, I will think that the first-grade calculation class is very simple and the children will forget it. Isn't the teacher a lot easier? In fact, the habit of first-grade children is forming, and it is not long to calm down and study in class. Therefore, when he sees that the class is part of the same old calculation problem, people often think that they have finished learning and no longer like listening and learning. From doing homework, the teacher can't find out who has unclear problems.

For example, almost all the children in today's class will work out the results when they learn to add and subtract whole ten. However, when it comes to how to calculate, everyone is a little vague. Some children don't talk about it actively. In fact, I can understand the state of the child. Such a simple four-way formula, Teacher Fan has to let us talk around it. The child really doesn't understand the teacher's intention. Problems must always be solved actively, and it is always our group of service providers who take adjustments.

Pre-test to understand the learning situation; Correct mistakes and clarify methods. Show me 50 questions, plus a few and the corresponding subtraction. After the children finished their calculations, they exchanged notes at the same table. After the correction, take out the wrong questions and communicate: what's wrong? In the process of error correction, it is gradually clear that when calculating such problems, we can think according to the composition of numbers. Dozens and dozens add up to dozens, and the result is dozens.

Remove dozens from dozens, and the result is several ones; Remove a few ones and the result is a few tens. Practice the consolidation algorithm; Situation, perception and association. The situation diagram of the examples in the book is used as an exercise. Ask the students to write four formulas according to a picture. As a result, students not only consolidate the algorithm, but also realize that when calculating the addition and subtraction of integer decimal, they can also associate according to the relationship between formulas and directly calculate the results.