Subtraction calculation of abdication within 20 is the difficulty in this unit. The textbook has arranged six lessons to learn the abdication subtraction of "ten MINUS several" This lesson focuses on the calculation methods of "ten MINUS eight", including formula method, drawing method, division by ten method and vertical arrangement method. The application of various methods can spread students' thinking and cultivate students' ability to solve multiple problems.

The design of this micro-lesson follows the teaching concept of from shallow to deep, which is easy for students to accept. At the same time, considering that students at different levels have different understanding and acceptance of different methods, several different problem-solving methods are provided, so that students can always find the one that suits them, let them feel the joy of success, and thus improve their interest in learning.

Finally, the assigned homework is expanded, so that students can try to do the calculation of "ten MINUS six", so that students can apply what they have learned and improve their knowledge transfer ability.

The abdication subtraction within 20 is the basis for students to learn calculation, and the algorithm of 12 minus 9 will be the beginning for students to think and calculate. Therefore, when designing micro-lessons, we can know the calculation principle of abdication subtraction within 20 by counting and drawing, master the basic method of abdication subtraction within 20, and calculate skillfully and accurately.

Primary school is a school where people receive primary formal education. It is an important part of basic education and belongs to nine-year compulsory education.

With the development of society, kindergartens have opened in front of it. Generally, children aged 6- 12 are of primary school age, and the length of primary school education at this stage is 6 years (or 5 years in a few places). After the primary education stage, it is the secondary education stage, that is, from primary school to junior high school (junior high school for short).

20 17 years * *, ordinary primary schools 18 1 10,000, a decrease of 0.3 million over the previous year. The national primary school enrollment was17.526 million, an increase of 235,000 over the previous year, with an increase of1.5%; Among them, urban primary schools enrolled 7.653 million students, an increase of 440,000, an increase of 9.3%. The number of primary school students was 9,965,438+3,000, an increase of 2.208 million or 2.3%. ? [ 1]?

In 2020, there will be158,000 ordinary primary schools in China. Pupils 18080900, students 107253500. There are 6,434,200 full-time primary school teachers. The net enrollment rate of primary school-age children is 99.96%.