Teaching plan of "Axisymmetric Graphics" in the second volume of mathematics in the second grade of primary school

Example 1 on page 29 of the second grade of primary school mathematics by People's Education Press and related contents.

Teaching objectives:

1, know the symmetry phenomenon, understand the meaning of symmetry axis and axisymmetric figure, and master the method of judging whether a figure is axisymmetric.

2. Through observation, operation, imagination, communication and other activities, we can perceive the symmetry phenomenon that exists in the real world and develop the concept of space.

3. Experience mathematics everywhere in life, reap the joy of success, and cultivate students' spirit of inquiry and aesthetic feeling.

Teaching focus:

Understand the symmetry phenomenon and the characteristics of axisymmetric graphics.

Teaching difficulties:

Master the method of identifying axisymmetric figures.

Teaching aid preparation:

Multimedia courseware, physical pictures, etc.

Teaching process:

First, the introduction of dialogue to stimulate interest

1, talk about the things you like to play in the playground, show the theme map and guide the students to observe.

2. "Symmetry" comes from a butterfly-shaped kite.

Second, cooperative inquiry, learning new knowledge

(A) observation of graphics, understanding symmetry

1. Observe several symmetrical figures to guide students to feel symmetry.

2. Talk about symmetry in life.

(B) hands-on, understand the axisymmetric graphics

1. guess: show some axisymmetric figures and guess how they came from.

2, hands-on operation, cut out the axisymmetric graphics.

(1) The teacher demonstrated the process of cutting a coat: folding, drawing and cutting.

(2) Students cut out their favorite axisymmetric figures.

(3) exchange and display students' works.

3. Know the axis of symmetry

(1) Take a look, touch and say.

(2) Drawing: The teacher demonstrates drawing the symmetry axis, and then the students draw it themselves, and then communicate.

4. Preliminary understanding of axisymmetric graphics.

(1) Tell me about the characteristics of axisymmetric graphics and get a preliminary understanding of axisymmetric graphics.

(2) Discussion: Discuss the method of judging axisymmetric figures (axisymmetric figures completely overlap after being folded in half).

(3) Give an example of an axisymmetric figure around you.

Third, consolidate practice and expand extension.

1, judge which are axisymmetric figures.

2. Guess: Show half of the axisymmetric figure and guess what it is.

3. Folding, drawing and counting: Rectangles, squares and circles have several symmetry axes.

Fourth, class summary.

What did you get from this lesson?

Fifth, appreciate the beauty of axisymmetric graphics.