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. Activity preparation 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 flow 1. 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 them classify the fruits, saying, "There are some big balls, and there are four;" Some are small balls, and there are two. "Let children understand the concept of the whole and the part, and list the addition and subtraction formulas: for example, 4+2 = 62+4 = 66-4 = 26-2 = 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, "There are some apples, and there are seven; "Some are pears, and there are three." Let children further understand the concepts of whole and part, and list addition and subtraction formulas. Such as: 7+3 =103+7 =1010-7 = 310-3 = 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 a partial number and also a partial number. This is the total. Similarly: 3+7 = 10 4+2 = 2+4 = 6 to guide children to distinguish which is the partial number? What's the total? How many parts are there? How many are there altogether? ② 10-3 = 7 apples 10, 3 pears and 7 fruits. This is the total. This is also part of the figure. Similarly: 10-7 = 364 = 26-2 = 4 to guide children to say 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 sum is at the end, and everything else is partial; 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 the brackets "()"; Written exercises; Teachers' itinerant guidance. 3+() = 4 5+() = 7 ()+2 = 5 ()+6 = 65,438+00 7-() = 3 ()-2 = 8 5-() = 65,438+0 ()-3 = 6 VIII. Teachers sum up the exercise results of checking children.