1. Learn to describe the plot, quantitative relationship and quantity by drawing, and master the application initially.

2. Understand the reciprocal relationship between addition exchange rate and addition and subtraction.

Preparation: pictures, calculation cards. The process of children's picture books (Volume III, page 55);

1. Guide the children to look at the pictures and tell the relationship between the pictures and the meaning.

Show the picture 1. Q: How many frogs are there in the pond? How many more people have come?

Can the problem in this picture be worked out by addition? Or subtraction. How to go public?

2. Guide children to learn to look at pictures and say the quantitative relationship in the same way.

3. Let the children freely choose pictures together, and tell each other the meaning of the question and coordinate the formula.

Teachers guide children who can't ask questions, let them ask questions with teachers, help them master the sentence structure of application questions, and then gradually let them master and learn to make up their own application questions.

4. Group operation.

(1) See the formula in the figure (see children's picture book). Encourage children to see the meaning clearly.

(2) Set the formula of three numbers to remind children to set one, write it down and read it out.

(3) The formula is connected with the dragon, and the number is connected with the back.