1. In the lead-in part, a list is generated by exchanging questions, so that students can extract the most valuable questions they want to ask, identify the students' question points, stimulate students' enthusiasm for learning, and fully create a learning atmosphere for students, so that students can truly understand and master basic mathematical knowledge and skills, mathematical ideas and methods in the process of independent inquiry and cooperative communication, and gain rich experience in mathematical activities.
2. In group activities, Teacher XX encouraged students to discover, think and find the best solution by themselves many times, and participated in the discussion and exchange of students, which activated students' thinking and triggered students' transformational thinking. Students actively use their hands and brains and think from different angles, and find that parallelogram can be transformed into rectangle for calculation, which makes the classroom full of effectiveness and allows students to experience the process of knowledge formation.
3. The design of class end detection is hierarchical and gradient. Class A and Class B are designed, including basic exercises and thinking development exercises, so that different students have different development.
Area calculation of parallelogram;
The teacher demonstrated an irregular figure with courseware and converted it into a rectangle to calculate its area. Ask the students to guess what the area of four parallel sides may have to do with it. Then, let the deskmate take a piece of paper with four parallel sides and cut it open to see if it can be transformed into a learned figure, thus confirming the students' guess.
Finally, the teacher asked the deskmate to compare another parallelogram with the merged rectangle, and organized the students to discuss: how to calculate the area of parallelogram on the basis of calculating the area of rectangle? The whole operation process is hierarchical, and students can use their hands, brains and mouths by cutting and pasting and spelling. Everyone participates in the learning process, not for operation, but to organically combine operation, understanding concepts and mathematical expression.
Let the students look at the pictures they cut and paste to explain mathematics, which reduces the difficulty of mathematical expression. Through operation, students can learn happily, fully understand knowledge, intuitively deduce the concept of parallelogram formula, and cultivate students' ability to acquire knowledge, observe and operate.