Taking 8/9 points and combinations as a new lesson in the video can deepen students' understanding. She not only asked the students to score one point in order, but also asked them to put eight stars on the table, which helped to test whether their scores were correct. I think: learning points and combinations lay the foundation for addition and subtraction within ten, so you can't use addition and subtraction to test whether your points are right or not, you can only put a few on the table.
The students in the video are divided in order, and there is another way. If the two numbers are the same, write one, without writing the way of exchanging positions. But when dividing in order, which step will be repeated? There is a sentence in the video, "When two numbers are the same or two numbers are next to each other, you don't have to write it down."
In this course, its methods are varied, not doing ordinary topics, but also playing cards. When the playing cards come out, you will feel relaxed and easy to study.
In the exercise, there is a combination of 3 and 5 (), which the students can't remember at the moment, but they remember that 4 and 4 are combined into 8, 3 is smaller than 4 1, and 5 is larger than 4 1. So they think 3 and 5 are 8, which is the first time I have encountered this idea in a video of grade one. More and more, I feel that mathematical thoughts have been influencing students imperceptibly.
In the process of practice, I always practice some basic topics, one number divided by two numbers, or two numbers combined into one number. But the teacher in the video asked, can you synthesize 8 with three numbers? In this problem, two numbers can be combined first, and the result of two numbers can be combined with the third number. You can also divide 8 into two numbers first and then divide one of them into two numbers. With both positive and negative reasoning methods, we can know which three numbers can synthesize 8. After that, I thought, dividing and combining is the foundation for addition and subtraction, and dividing 8 into three numbers is actually the foundation for addition and subtraction. Every link of the lecture is not added casually, so we should keep learning and making progress.