Teaching aid: a basket full of balls (4 big balls and 2 small balls); A fruit basket (7 apples and 3 pears)

Learning tools: each person has a "small animal card" package (two varieties, different quantities, the total does not exceed10); One box of plasticine per person; Everyone has a pencil and a math exercise book.

Activity process

First of all, the teacher shows the small basket with the ball and asks the children to talk about what is in the basket, how many are there, and what are the similarities and differences. Guide the children to say the total number, and then let the children classify the fruits and say, "There are some big balls, and there are four.

a； Some are small balls, and there are two. "Let children understand the concept of whole and part, and list the addition and subtraction formulas, such as

4+2=6 2+4=6 6-4=2 6-2=4

Second, the teacher shows a small basket full of fruits. Let the children talk about what is in the basket, how many are there, and what are the similarities and differences. The child said the total number, and then asked the child to classify the fruits and said, "Some are apples, and there are seven; Some are pears, and there are three. "Further let children understand the concepts of the whole and the part, and list the addition and subtraction formulas. For example:

7+3= 10 3+7= 10 10-7=3 10-3=7

Third, guide children to do "corresponding oral exercises" such as:

① 7 + 3 = 10

Apple is seven pears, but there are three, and the total is 10.

This is the partial number and the partial number, and this is the total.

Similarly: 3+7 = 104+2 = 2+4 = 6 to guide the children to tell which part number is it? What's the total? How many parts are there? How many are there altogether?

② 10 -3 = 7

The fruit has 10 apples, 3 pears and 7 pears.

This is the total, this is a partial number, and it is also a partial number.

Similarly: 10-7 = 364 = 26-2 = 4 Guide the children to tell which is the total? What is a partial number? How many parts are there? How many are there altogether?

Fourth, guide children to say key sentences. For example:

(1) In the addition formula, the total number is at the end, and the rest are partial numbers; In the subtraction formula, the total comes first, and the others are partial numbers.

It is concluded that the total sum of addition is at the end and the total sum of subtraction is at the front.

(2) The sum of part number and part number is the total. If you remove (subtract) the partial number from the total, the rest is still the partial number.

It is concluded that the total demand is the sum of some figures; Find a partial number and subtract another from the total.

Five, children play cards. Children take out cards, pour out small animal cards, talk about what they have, how many in total, classify them and make records. Tell your partner the results of your own classification records.

Sixth, children play with plasticine. The rule is that everyone can write two kinds of articles, no matter how many. 10 minutes later, let the children say how many things they have pinched, what is one part and how much, what is the other part and how much. Take notes and tell me which is the total and which is the partial number.

Seven, children know brackets "(

)"; Written exercises; Teachers' itinerant guidance.

3+( )=4 5+( )=7 ( )+2=5 ( )+6= 10

7-( )=3 ( )-2=8 5-( )= 1 ( ) -3=6

Eight, the teacher summed up the results of checking the children's exercises.

Design intent

Facing the big class children, I have a preliminary understanding, experience and understanding of the concept of number in mathematics. In order to let children understand every number in the addition and subtraction formula, to let children enter primary school smoothly, to lay a good foundation for children to learn mathematics in the future, to cultivate children's thinking ability and to stimulate children to explore the mysteries of mathematics.

Activity purpose

1, understand the concepts of total number and partial number and their relationship with you through children's hands-on operation.

2. On the basis of learning addition and subtraction within 10, children can add and subtract the fill-in-the-blank questions in the formula within 10 through writing practice.