小学数学五年级下册教学反思（The fifth grade primary school mathematics teaching reflection ）.doc

小学数学五年级下册教学反思（The fifth grade primary school mathematics teaching reflection ）.doc小学数学五年级下册教学反思(The fifth grade primary school mathematics teaching reflection 2)
The fifth grade primary school mathematics teaching reflection 2
The teaching reflection of "axial symmetry figure"
Symmetry is a basic graphic transformation, is the necessary basis for learning space and graphics knowledge, to help students establish the concept of space, cultivate the students' spatial imagination has an important role.
This book first teaching materials in axial symmetry, the arrangement of various forms of activities, in the teaching of this lesson, bine the characteristics of teaching materials, design three operating activities, let students hands-on experience gradually basic characteristics of axial symmetry in operation.
First, create situational teaching, please fold the clothes of the students on stage to show the method of folding clothes. Thus leads to the subject. Then, 1, show axisymmetric objects: Tiananmen, airplane, trophy, and let students observe what they have mon The students observed that they were the same on both sides. 2 cut young trees: through different shear methods, teachers and students to evaluate that these figures are the same on both sides, so the paper folded first, and then cut, cut and then spread out, this is a small tree.
This is the first activity in this class, arranged in the
students observe the symmetry of life, the purpose is to let students in the operation of preliminary perception of axisymmetric phenomenon. This looks like a student activity to operating activities, but to a small tree or a beautiful window, not to find the law, it is also very difficult, through student exchanges, can initially perceive the same graphics on both sides can be folded up and then cut, this is the initial perception of axis symmetry feature.
Two, to draw, fold, we get down below the students to see the objects painted graphics (Tiananmen, aircraft, trophies and other grouping) discussion, draw the conclusion that the symmetrical on