In the activity, I think the teacher began to introduce the topic with the figures such as rectangles and squares that children know, and turned the rectangles into trapezoid by magic. This method of understanding trapezoid through comparative observation makes children initially perceive the different characteristics of rectangle and trapezoid, and the effect is good. Children are very involved and can quickly understand the characteristics of trapezoid. In the last operation, I asked my children to practice in children's picture books, let them observe and compare the trapezium created by themselves, and then circle the trapezium in multiple figures to further deepen their judgment and understanding of the trapezium. Children like to look at their own works and find out the trapezoid. Can finish homework well, which shows that children have a good grasp of trapezoid.
Disadvantages: I have just changed a rectangle into a trapezoid, and I can change a trapezoid with squares and triangles in the future, which can further enable children to master the main characteristics of a trapezoid.