1, learn to calculate the number of objects in the circle when two circles intersect.

2. According to the requirements of the marking diagram, explore to place a corresponding number of objects in the circle.

3. Experience the success of solving problems and the fun of cooperative games.

Second, the activity preparation

Whiteboard courseware, many hula hoops, 10 baby bottles, rabbits and hoops for children to operate.

Third, the activity process

(1) Playing the "mouse cage" game, several little mice gathered around.

(2) Play with the ferrule and see the marking record.

1, show bottles, instruct children to count the number of bottles, and let children play with hoop.

2. Show the marker, let the children talk about the meaning of the marker, and record the number of baby bottles in the circle.

3. Please ask several children and teachers to ring the bell at the same time, set two rings and set a bottle baby at the same time, and lead the children to discuss: the blue circle and the red trap have the same bottle baby, who should be the bottle baby?

(3) Learn to count the number of milk bottles in two circles when they intersect.

1, demonstrate the process of the same baby bottle in two traps on the whiteboard, and lead children to analyze the characteristics of the baby bottle in the cross part: there are red circles and blue circles, and make statistics when counting the number of baby bottles in the two circles.

Display chart 1 (see CD-ROM video, the same below), the teacher will demonstrate on the whiteboard while explaining: a milk bottle in a red trap, blue circle is coming, where is the red circle? (Cross) Where is the baby bottle now? (Middle) Do you mean this place by "middle"? (Draw a place with children by hand) This is where the red circle and the blue circle meet. Take a closer look, children. Is the baby bottle in the red circle? (Fade blue) Is it in the blue circle? (Lighten the red color) This bottle has both red and blue rings. When we count the babies in the red trap, we should count the babies in public places, and when we count the babies in the blue trap, we should also count the babies in public places, remember?

2. Show Figure 2, Figure 3, Figure 4, and Figure 5 respectively, and change the number of milk bottles in the cross part to guide children to correctly count the number of milk bottles in the red and blue circles.

(With the help of the functions of dragging, changing color and moving the whiteboard, let the children intuitively see how two circles intersect to form a public office, make clear the range of objects to be counted, and let the children really understand the characteristics of the public office. This is the focus and difficulty of this activity. )