Activity objectives:
1, guide children to learn the formulas of three physical diagrams, learn the addition and subtraction of 2, and know the plus sign, minus sign and equal sign (understand their meanings).
2, inspire children to express the meaning of a picture in one sentence, pay attention to the correct words.
3. Learn to write addition and subtraction formulas.
Activity preparation:
Physical map of teaching AIDS. Learning tools and operating materials.
Activity flow:
I. Group activities
1. Look at three pictures and learn the addition of 2.
(1) as shown in figure 1. "These three pictures are about one thing, and each picture can be made clear in one sentence. Please read it carefully and tell it to everyone after reading it. " "Say the first picture first. Who's there? " (There is a chicken on the grass) "What should I say if I look at the second picture again? (Here comes another chicken) Connect the first picture with the second picture. " "Who can tell the third picture? (One * * * has two chickens) Who will connect these three pictures and say? " Children say three sentences individually and collectively. "How do we write down what just happened? There are 1 chicken on the grass. There is another 1 chicken. What do you mean? " "What does it mean to have two chickens?" The children recorded with numbers while answering the teacher. "With what symbol? (+) What symbol is used to indicate the existence of * *? (=) "(refers to+)" What symbol is this? " (plus sign) "How to pronounce it?" (plus sign) (pointing to the = symbol) "What symbol is this?" (equal sign) "How to pronounce it?" (equal to) (1+ 1=2) "What does this formula mean? Let's talk about it together. " Point to the numbers and symbols and say the meaning (corresponding to the following):
There are 1 chicken on the grass. 1 Here comes the chicken. There are two chickens.
1 + 1 = 2
"Let's read the formula twice together."
(2) Show Figure 2.
"These three photos say the same thing. Who will explain each picture clearly in one sentence? Then how to express it by formula? " (1+ 1=2) "Read the formula twice together."
2. Look at three pictures and learn the subtraction of 2.
(1) as shown in figure 3.
"What are these three pictures about? Put the first picture first (there are two rabbits on the grass). " "Look at the second photo. Who will speak? " "Come or go? How did you see that? " "Let's put the first picture and the second picture together, and then think about what the third picture should say?" "Let's talk about the three pictures together." "Who would use a formula to record this?"
There are two rabbits on the grass, 1 rabbit is missing, leaving 1 rabbit.
2 — 1 = 1
"This symbol (-), you know? What's your name? How to pronounce (minus sign)? (subtraction) This formula is called subtraction formula. " "Let's read it together."
(2) Show Figure 4.
"These three photos also illustrate one thing. Can you make it clear in three sentences? " "Who will use the formula to record?" (2- 1 = 1) "Who can tell me what each number and symbol in this formula means on the diagram?"
Second, group activities.
1. Look at the picture and tell the meaning, and guide the children to list the addition and subtraction formulas of 2 correctly.
First look at the picture and explain the meaning in three sentences, then list the formulas.
2. Look at split numbers.
3. Fill in the blanks according to the examples.
Activity reflection:
In the design of teaching activities, in the spirit of highlighting the outline, we will promote the development of children in all aspects from different angles and highlight the subjective spirit of self-confidence. This activity mainly guides children to explore the addition and subtraction of 2 through hands-on operation from the aspects of life, fun, process, science and openness. In the process of operation, children experience and perceive the significance of addition and subtraction, experience the process of abstracting the two parts together for addition operation, and initially realize that there are many problems in life that need to be solved by addition and subtraction.